Proxy Wars & Axis of Resistance

Origins and Rise to Power

Hezbollah emerged in 1982 during the chaos of the Israeli invasion of Lebanon, which aimed to expel the Palestine Liberation Organization (PLO) from its bases in southern Lebanon. In the aftermath of the invasion, Iran's newly established Islamic Republic dispatched approximately 1,500 IRGC personnel to the Bekaa Valley, where they began training and organizing Shia Lebanese militants. What began as a collection of loosely affiliated Shia guerrilla cells gradually consolidated into Hezbollah, which announced its existence publicly in 1985 with an "Open Letter" that declared commitment to the Islamic Revolution and the destruction of Israel.

Throughout the 1980s, Hezbollah waged a guerrilla campaign against Israeli forces occupying southern Lebanon and against Western targets in Beirut. The group was responsible for the devastating 1983 bombing of the US Marine barracks in Beirut, which killed 241 American servicemen and prompted the US withdrawal from Lebanon. It also carried out the bombing of the French military barracks the same day, killing 58 French paratroopers. These attacks established Hezbollah's reputation as a formidable and ruthless organization willing to take on the world's most powerful militaries.

Hassan Nasrallah: Leader 1992–2024

In 1992, following the Israeli assassination of Hezbollah's first leader, Abbas al-Musawi, the organization selected 32-year-old Hassan Nasrallah as its new Secretary-General. Over the next three decades, Nasrallah transformed Hezbollah from a guerrilla movement into the most powerful non-state military force in the world. Under his leadership, Hezbollah built a vast social services network, entered Lebanese parliamentary politics, and accumulated an arsenal that rivaled many nation-states. Nasrallah became one of the most recognized and polarizing figures in the Arab world, celebrated by supporters as a resistance hero and condemned by opponents as a terrorist leader.

Nasrallah's defining moment came in the 2006 Lebanon War. After Hezbollah kidnapped two Israeli soldiers in a cross-border raid, Israel launched a massive 34-day military campaign. Despite Israel's overwhelming firepower, Hezbollah fighters held their ground, launching nearly 4,000 rockets into northern Israel and inflicting significant casualties on Israeli ground forces. The war ended inconclusively, with Hezbollah surviving intact and Nasrallah claiming a "divine victory" — the narrative that Hezbollah had accomplished what no Arab army had: fighting Israel to a standstill.

On September 27, 2024, Nasrallah was killed in a massive Israeli airstrike that targeted his underground bunker in the Dahieh suburb of southern Beirut. The strike, which used dozens of bunker-buster bombs, collapsed several apartment buildings above the target. His death sent shockwaves through the Axis of Resistance and was considered the most significant Israeli targeted killing since the assassination of Hamas leader Sheikh Ahmed Yassin in 2004. The elimination of Nasrallah, along with much of Hezbollah's senior military command in the preceding weeks, represented a devastating blow to the organization.

Arsenal and Military Capabilities

Prior to the 2023–2024 conflict, Hezbollah was estimated to possess over 150,000 rockets and missiles, the largest arsenal of any non-state actor in history. This stockpile ranged from simple unguided Katyusha rockets capable of reaching northern Israeli communities to advanced precision-guided munitions (PGMs) that could strike specific targets deep inside Israel. The most concerning element of Hezbollah's arsenal was its growing collection of Iranian-supplied precision-guided missiles, which transformed its rockets from area-denial weapons into strategic strike tools capable of hitting military bases, power plants, and critical infrastructure with accuracy measured in meters.

Beyond rockets, Hezbollah fielded the Radwan Force, an elite special operations unit estimated at several thousand fighters trained in offensive ground operations, including cross-border infiltration. The Radwan Force was designed to seize territory in northern Israel in the opening hours of a major conflict, creating a "ground invasion" scenario that would overwhelm Israeli defenses. Intelligence reports indicated that Hezbollah had planned an October 7-style attack on the northern Galilee communities, a plan that was disrupted by Israel's preemptive intelligence gathering and military operations.

2023–2024 Escalation and Israeli Campaign

Beginning on October 8, 2023, one day after Hamas's attack on southern Israel, Hezbollah opened a "support front" along the Israeli-Lebanese border. For over a year, daily exchanges of fire took place across the Blue Line, with Hezbollah launching anti-tank missiles, rockets, and drones at Israeli military positions and border communities, while the IDF struck Hezbollah positions and commanders in southern Lebanon. Approximately 60,000 Israeli civilians were evacuated from communities within several kilometers of the border, creating a humanitarian crisis in northern Israel.

In September 2024, Israel launched a devastating escalation against Hezbollah. The campaign began with the pager and walkie-talkie attacks on September 17–18, which wounded thousands of Hezbollah operatives and destroyed the organization's secure communications network. This was followed by a rapid campaign of targeted assassinations that eliminated much of Hezbollah's senior military leadership, culminating in the killing of Nasrallah himself. Israel then launched ground operations in southern Lebanon while conducting one of the most intensive bombing campaigns in modern Middle Eastern history.

The campaign resulted in massive destruction in southern Lebanon and Beirut's southern suburbs. Thousands of Lebanese civilians were displaced, and Hezbollah's military infrastructure suffered enormous damage. A ceasefire was reached in November 2024, requiring Hezbollah to withdraw its forces north of the Litani River and allowing the Lebanese Armed Forces and an expanded UNIFIL mission to deploy in the border zone.

Post-Nasrallah Era

As of early 2026, Hezbollah remains a significant force but is substantially weakened. The organization has lost its charismatic leader, much of its senior military command, and a significant portion of its arsenal. However, Hezbollah's deep roots in Lebanese Shia society, its extensive social services network, and Iran's continued financial support ensure its survival. The organization has begun a slow rebuilding process, reconstituting its command structure under new leadership and replenishing its weapons stocks through remaining supply channels. Hezbollah also continues to play a dominant role in Lebanese politics, where it remains the single most powerful political and military entity in a fractured state.

Hamas: The Unusual Alliance

Hamas (Harakat al-Muqawama al-Islamiyya, "Islamic Resistance Movement") represents one of the most strategically significant members of the Axis of Resistance, and paradoxically one of its most unusual. Founded in 1987 during the First Intifada as an offshoot of the Egyptian Muslim Brotherhood, Hamas is a Sunni Islamist organization. Its alliance with Shia Iran defies the sectarian logic that dominates much of Middle Eastern geopolitics. Yet this relationship, which has endured for decades despite periodic tensions, demonstrates that shared enmity toward Israel can transcend the deepest religious divides.

The Iran-Hamas relationship has not always been smooth. During the Syrian Civil War (2011–2016), Hamas broke with Iran and the Assad regime, siding instead with the Syrian Sunni opposition. Hamas's political bureau left Damascus, and Iranian funding reportedly dropped significantly. However, the relationship was gradually repaired beginning around 2017, driven by Hamas's isolation from other potential patrons after the fall of Egypt's Muslim Brotherhood government in 2013 and the cooling of relations with Qatar and Turkey. By 2023, Iran had resumed substantial financial and military support, providing Hamas with weapons technology, training, and an estimated $100 million or more annually.

October 7, 2023: Al-Aqsa Flood

On the morning of October 7, 2023, Hamas launched "Operation Al-Aqsa Flood," the most devastating attack on Israeli soil in the nation's history. Approximately 3,000 Hamas and allied fighters breached the Gaza-Israel border fence at more than 30 points, using a combination of paragliders, motorcycles, and vehicles. They overran multiple Israeli military bases and attacked neighboring civilian communities, kibbutzim, and the Nova music festival. Over 1,200 people were killed and approximately 250 were taken hostage into Gaza.

The attack revealed catastrophic failures in Israeli intelligence and border security. Hamas had spent years preparing the operation in near-total secrecy, constructing training facilities underground in Gaza and coordinating a complex multi-axis assault that overwhelmed Israel's technological surveillance systems and the Gaza Division's defensive positions. The Nukhba Force, Hamas's elite commando unit, led the assault, demonstrating tactical proficiency that surprised Israeli military planners who had long dismissed Hamas as a minor threat compared to Hezbollah.

The question of Iran's direct involvement in planning October 7 remains debated. US and Israeli intelligence have not established that Iran ordered or directed the attack, though it is widely acknowledged that decades of Iranian weapons technology transfers, training, and funding created the capabilities that made the operation possible. Iran publicly celebrated the attack while maintaining a degree of plausible deniability regarding advance knowledge.

The Gaza War (2023–2025)

Israel's military response to October 7 was the most intensive campaign in the Israeli-Palestinian conflict's history. Operation Swords of Iron, later expanded into a comprehensive ground invasion, saw IDF forces enter the Gaza Strip with the stated goal of destroying Hamas's military and governing capabilities. The campaign involved massive aerial bombardment followed by ground operations that systematically moved through Gaza City, Khan Younis, and eventually Rafah.

The scale of destruction was enormous. Large sections of Gaza City and northern Gaza were reduced to rubble. The Palestinian death toll, according to Gaza health authorities, exceeded 40,000 by mid-2025, though the exact figures remain disputed. Millions of Palestinians were displaced within the narrow strip, and a severe humanitarian crisis unfolded as food, water, medical supplies, and fuel were restricted. The war drew intense international criticism, with proceedings opened at the International Court of Justice and the International Criminal Court.

Despite the unprecedented scale of the Israeli military campaign, Hamas demonstrated remarkable resilience. Its extensive tunnel network, estimated at over 500 kilometers of underground passages beneath Gaza, allowed fighters to survive bombardment, move between positions, and launch ambushes against advancing Israeli forces. The tunnels served as command centers, weapons storage facilities, and, controversially, locations where hostages were held. The IDF's experience in the tunnels — nicknamed "the Gaza Metro" — proved to be one of the most challenging urban warfare environments in modern military history.

Yahya Sinwar: Mastermind and Death

The architect of October 7 was Yahya Sinwar, who had risen from a Hamas prisoner released in the 2011 Gilad Shalit exchange to become the leader of Hamas in Gaza. A former head of Hamas's internal security apparatus known for his ruthlessness, Sinwar had spent 22 years in Israeli prisons, during which he learned Hebrew and studied Israeli society and military doctrine. His understanding of Israel's psychology and his willingness to accept catastrophic consequences for Gaza's civilian population in pursuit of strategic goals made him one of the most dangerous adversaries Israel had faced.

Sinwar was killed by IDF forces in October 2024 in the southern Gaza city of Rafah, reportedly during an encounter with an Israeli patrol. His death, while symbolically significant, did not end Hamas's resistance. By that point, the organization had already adapted to operating in a highly degraded state, with decentralized command structures designed to survive the loss of senior leaders. The killing of both Sinwar and Nasrallah within weeks of each other in late 2024 represented an unprecedented decapitation of two major Axis of Resistance organizations.

Palestinian Islamic Jihad: Iran's Closest Palestinian Ally

Palestinian Islamic Jihad is smaller than Hamas but maintains even deeper ties to Iran. Founded in 1981 by Fathi Shaqaqi, who was inspired by the Iranian Revolution, PIJ has always been more ideologically aligned with Tehran than Hamas. Unlike Hamas, which has political and social service wings, PIJ is primarily a military organization focused almost exclusively on armed resistance against Israel. The group does not participate in Palestinian elections or governance and has no territorial ambitions in Palestinian politics.

PIJ's military wing, the Al-Quds Brigades, fields an estimated 10,000 fighters and operates primarily in Gaza, with smaller cells in the West Bank. The organization has been responsible for numerous rocket attacks on Israel and suicide bombings during the Second Intifada. PIJ has served as a key conduit for Iranian weapons technology and tactical knowledge transfer to Palestinian militant groups. Its fighters participated alongside Hamas in the October 7 attack and in the subsequent defense of Gaza against the Israeli ground operation.

Weapons and Iranian Technology Transfer

Iran's weapons support to Hamas and PIJ has focused on technology transfer rather than direct weapons shipments, given the difficulty of smuggling finished weapons into the blockaded Gaza Strip. Iranian engineers provided designs and technical expertise that enabled Hamas to manufacture rockets domestically in Gaza's underground workshops. The progression from crude, short-range Qassam rockets to more capable systems like the M-75 and J-80 (with ranges reaching 80 km and beyond) was a direct result of Iranian technical assistance. Hamas also received Iranian designs for anti-tank guided missiles (ATGMs), including the Kornet-type missiles that proved devastating against Israeli Merkava tanks, and for drones based on Iranian Ababil designs.

Origins: From Religious Revival to Armed Insurgency

The Houthi movement emerged in the 1990s in the Saada province of northern Yemen as a Zaydi Shia religious and cultural revivalist organization. Zaydism, the oldest branch of Shia Islam, is distinct from the Twelver Shiism practiced in Iran, and historically the two traditions had limited interaction. The movement was founded by Hussein Badreddin al-Houthi, a member of the Yemeni parliament who became increasingly vocal in opposing the Yemeni government's alliance with the United States and its perceived marginalization of Zaydi communities in the north.

Armed conflict between the Houthis and the Yemeni government began in 2004 when President Ali Abdullah Saleh attempted to arrest Hussein al-Houthi, who was killed in the subsequent military operation. Far from crushing the movement, Saleh's military campaigns radicalized and strengthened it. Over six rounds of fighting between 2004 and 2010, the Houthis evolved from a religious protest movement into a battle-hardened guerrilla army. The movement adopted the name "Ansar Allah" (Supporters of God) and its distinctive slogan: "God is Great, Death to America, Death to Israel, Curse Upon the Jews, Victory to Islam."

The Yemen Civil War and Saudi Intervention

The Arab Spring upheaval of 2011 destabilized Yemen, creating the conditions for the Houthis to expand far beyond their northern stronghold. In September 2014, Houthi forces swept into the capital Sanaa, eventually forcing President Abd Rabbuh Mansour Hadi to flee to Saudi Arabia. In March 2015, a Saudi-led coalition of Arab states launched Operation Decisive Storm, a military intervention aimed at restoring Hadi's government. The resulting war became one of the world's worst humanitarian catastrophes, with an estimated 377,000 deaths by 2022 and millions facing famine.

The Saudi-led coalition's air campaign, while devastating to Yemeni civilians, failed to dislodge the Houthis from power in northwestern Yemen. Instead, the war drove the Houthis closer to Iran, which saw an opportunity to create a new front against Saudi Arabia at minimal cost. Iran's IRGC began supplying the Houthis with increasingly sophisticated weapons, including anti-ship missiles, ballistic missiles, cruise missiles, and armed drones. The Houthis demonstrated these capabilities by launching missiles and drones at Saudi oil facilities, airports, and population centers, most notably the September 2019 attack on Saudi Aramco's Abqaiq processing facility that temporarily halved Saudi oil production.

Red Sea Campaign: Disrupting Global Trade

The Houthis' most consequential action in the Israel-Iran conflict began in October 2023, when Ansar Allah declared solidarity with Hamas and announced that they would attack any vessel in the Red Sea connected to Israel. What began as targeted attacks on Israeli-linked shipping rapidly expanded into a broader campaign against commercial shipping transiting the Bab el-Mandeb Strait and the southern Red Sea, one of the world's most critical maritime chokepoints through which approximately 12% of global trade passes.

Between October 2023 and early 2026, the Houthis attacked over 100 commercial vessels using a combination of anti-ship ballistic missiles (ASBMs), anti-ship cruise missiles, naval drones, and fast-attack boats. Several ships were sunk or severely damaged, and one crew member was killed. The attacks forced major shipping companies to reroute their vessels around the Cape of Good Hope, adding 10–14 days and significant fuel costs to Asia-Europe trade routes. Traffic through the Suez Canal, Egypt's most important source of revenue, dropped by over 50%, costing Egypt billions of dollars in canal fees and creating a ripple effect across the global economy.

The Houthis also launched direct attacks on Israel, firing ballistic missiles and drones across the approximately 2,000 kilometers separating Yemen from Israeli territory. While most of these were intercepted by Israeli or US defense systems, the attacks demonstrated that a relatively unsophisticated militia in one of the world's poorest countries could threaten one of the world's most technologically advanced nations — a powerful validation of Iran's proxy warfare strategy.

Operation Prosperity Guardian and US/UK Response

In response to the Red Sea attacks, the United States formed Operation Prosperity Guardian in December 2023, a multinational naval coalition designed to protect commercial shipping. The US and UK navies conducted repeated strikes against Houthi launch sites, radar installations, and weapons storage facilities in Yemen. These strikes, which began in January 2024 and continued into 2026, degraded some Houthi capabilities but failed to stop the attacks. The Houthis proved adept at dispersing their weapons systems, using mobile launchers, and reconstituting destroyed capabilities with Iranian resupply.

The US Navy's campaign to defend shipping in the Red Sea became one of the most intensive naval operations since World War II. American destroyers, including USS Carney, USS Mason, and USS Laboon, intercepted hundreds of Houthi projectiles, at enormous cost. Each Standard Missile-2 or SM-6 interceptor costs between $2–4 million, while the Houthi drones they were shooting down cost a fraction of that amount. This asymmetric cost imbalance highlighted a fundamental challenge in countering proxy warfare.

Iranian Weapons Supply

The sophistication of Houthi attacks was directly attributable to Iranian weapons and technology. Weapons seized en route to Yemen, combined with analysis of debris from Houthi attacks, confirmed the transfer of numerous Iranian weapons systems. These included Toophan anti-tank guided missiles (Iranian copies of the US TOW missile), Quds-1 and Quds-2 cruise missiles (derivatives of the Iranian Soumar/Ya-Ali cruise missile), Shahed-136 one-way attack drones, anti-ship ballistic missiles based on Iranian designs, and the components and expertise needed for local manufacture of additional weapons. Iran's use of dhows and fishing vessels to smuggle weapons through the Arabian Sea to Yemen's coastline proved difficult for the US Navy to fully interdict.

The Iraqi component of Iran's proxy network is centered on the Popular Mobilization Forces (PMF, known in Arabic as al-Hashd al-Sha'abi), an umbrella organization of predominantly Shia militias that was formally established in 2014 in response to a religious edict (fatwa) by Grand Ayatollah Ali al-Sistani calling on Iraqis to defend their country against the Islamic State (ISIS). While the PMF was created as a nominally Iraqi institution, several of its most powerful constituent groups maintain deep operational and ideological ties to Iran's IRGC, effectively functioning as Iranian proxy forces operating within the Iraqi state.

The PMF has grown into a massive force with an estimated 100,000–150,000 fighters, an official budget from the Iraqi government exceeding $2 billion annually, and significant political representation in the Iraqi parliament. The most Iran-aligned factions within the PMF operate as a state-within-a-state, maintaining their own intelligence apparatus, weapons procurement channels, and command structures that bypass the Iraqi chain of command and answer directly to the IRGC Quds Force.

Key Militia Groups

Post-October 7 Attacks on US Forces

Following the October 7, 2023 Hamas attack and the Israeli military campaign in Gaza, Iran-aligned Iraqi militias launched an intense campaign against American military personnel stationed in Iraq and Syria. Between October 2023 and February 2024 alone, these groups carried out over 150 attacks on US bases using rockets, one-way attack drones, and ballistic missiles. The attacks targeted facilities including Al-Asad Air Base, Erbil Air Base, Al-Tanf garrison in Syria, and numerous smaller installations across the region.

The escalation reached a critical point on January 28, 2024, when a drone attack on Tower 22, a US military outpost at the Jordan-Syria border, killed three American soldiers and wounded more than 40 others. The attack, attributed to Kata'ib Hezbollah, was the first killing of US service members by Iranian proxy forces in the post-October 7 period. The US responded with a wave of retaliatory strikes against Kata'ib Hezbollah and other militia facilities in Iraq and Syria, targeting weapons storage sites, command centers, and intelligence facilities.

Following the US retaliatory strikes, Kata'ib Hezbollah announced a "tactical pause" in attacks on American targets in February 2024. However, other Iran-aligned groups continued lower-level operations, and the threat to US forces remained elevated. The episode illustrated both the power and the limitations of Iran's proxy strategy: the militias could impose costs on the US military and create political pressure for withdrawal, but escalating too far risked a direct US-Iran confrontation that Tehran wished to avoid.

The Land Bridge: Iran's Strategic Corridor

One of the most strategically significant roles of Iraq's Iran-aligned militias has been maintaining what analysts call the "land bridge" — a contiguous overland supply route stretching from Iran through Iraq and Syria to Lebanon. This corridor enables Iran to move weapons, fighters, financial resources, and other materiel to Hezbollah and other allies without relying on air or sea transport, which are more vulnerable to interdiction. The control of key border crossings between Iraq and Syria, particularly the al-Qa'im/Abu Kamal crossing, has been a primary objective of Iran-aligned militias.

Political Power in Iraq

Beyond their military role, Iran-aligned militias wield enormous political influence within the Iraqi state. The Fatah Alliance, the political coalition associated with the PMF, holds significant seats in the Iraqi parliament and has influenced the selection of prime ministers and other key officials. Militia leaders like Hadi al-Amiri and Qais al-Khazali operate simultaneously as military commanders, political leaders, and businessmen, controlling vast economic enterprises including construction, telecommunications, and import-export businesses.

This fusion of military, political, and economic power makes the Iran-aligned militias extremely difficult to dislodge. Even Iraqi governments that have attempted to assert sovereignty over the PMF have found themselves constrained by the militias' willingness to use violence and their deep penetration of state institutions. The Iraqi army's dependence on the PMF during the anti-ISIS campaign (2014–2017) created a dynamic where the militias became formally integrated into the state while maintaining their independent command structures and loyalty to Iran.

Iran's Oldest Arab Ally

The relationship between Iran and the Assad regime in Syria was the oldest and most strategically important alliance in the Axis of Resistance. The partnership dates to 1980, when Hafez al-Assad's Syria became the only Arab state to support Iran during the Iran-Iraq War (1980–1988), a conflict in which virtually every other Arab government backed Saddam Hussein's Iraq. This counter-intuitive alliance — between a secular Ba'athist regime and an Islamic theocracy — was rooted in mutual hostility toward Iraq's Saddam Hussein and a shared strategic interest in dominating Lebanese politics through support for Hezbollah.

For Iran, Syria served as the indispensable geographic link connecting Tehran to Hezbollah in Lebanon. Without Syrian territory and the complicity of the Assad government, Iran could not have sustained the massive weapons pipeline that transformed Hezbollah from a small guerrilla group into the most heavily armed non-state actor on earth. Syrian ports, airports, and overland routes facilitated the transfer of rockets, missiles, components, and raw materials from Iran to Hezbollah. The Iranian embassy in Damascus served as a major operational hub for IRGC Quds Force activities across the Levant.

The Syrian Civil War: Iran and Hezbollah Save Assad

When the Syrian uprising began in 2011 and escalated into a full-scale civil war, the Assad regime faced an existential threat. By 2012, rebel forces controlled significant swathes of the country and were closing in on Damascus itself. The survival of the Assad regime became a top strategic priority for Iran, which recognized that losing Syria would sever the land bridge to Hezbollah and collapse the entire architecture of the Axis of Resistance.

Iran's response was massive and multifaceted. The IRGC Quds Force deployed thousands of advisors and combat forces to Syria. More critically, Iran organized and funded the deployment of Hezbollah fighters, who became the Assad regime's most effective ground force. At the peak of the intervention, an estimated 5,000–8,000 Hezbollah fighters were deployed in Syria simultaneously, fighting in the battles of Qusayr (2013), Aleppo (2016), and numerous other engagements. Iran also mobilized tens of thousands of Afghan Shia fighters (the Fatemiyoun Division) and Pakistani Shia fighters (the Zainabiyoun Brigade), recruited from impoverished communities with the promise of salaries, Iranian residency, and religious duty.

The combined Iranian-Hezbollah-Russian intervention (Russia joined in 2015 with airpower) ultimately saved the Assad regime. By 2018, the government had recaptured most major population centers, though the country remained divided between regime-controlled areas, Turkish-backed zones in the north, Kurdish-controlled territory in the northeast, and the rebel-held province of Idlib. The cost to Iran was estimated at over $15 billion in direct expenditures, plus the toll of hundreds of IRGC and Hezbollah fighters killed in combat.

IRGC Presence and Weapons Infrastructure

By the early 2020s, the IRGC had built a substantial military infrastructure across Syria. Quds Force advisors were embedded with Syrian army units, IRGC-linked weapons warehouses stored missiles and components destined for Hezbollah, and Iranian drone facilities operated from several locations. The T-4 (Tiyas) airbase in central Syria became a particularly important hub for Iranian drone operations, hosting IRGC personnel and serving as a staging point for weapons transfers.

Iran's military presence in Syria was not limited to advisory roles. Iran established militia forces composed of Syrian fighters loyal to Tehran, including the Local Defense Forces and various "auxiliary" units that answered to the IRGC rather than the Syrian military. Iran also invested heavily in economic assets in Syria, securing long-term contracts for phosphate mining, real estate development, telecommunications, and reconstruction projects — effectively converting military influence into permanent economic leverage.

Israel's "Campaign Between Wars"

Israel viewed Iran's military buildup in Syria as an unacceptable strategic threat and launched an extensive air campaign, known internally as the "Campaign Between Wars" (Mabam), aimed at preventing the entrenchment of Iranian military assets on its northern border. Between 2013 and 2024, the Israeli Air Force conducted hundreds of strikes in Syria targeting Iranian weapons shipments, missile production facilities, IRGC commanders, and Hezbollah logistics infrastructure. These strikes were conducted with a tacit understanding from Russia, which controlled Syrian airspace through its S-400 air defense systems but generally chose not to interfere with Israeli operations against Iranian targets.

The most significant of these strikes included the February 2018 attack on T-4 airbase, which killed seven IRGC personnel including a senior officer; the November 2019 strikes that targeted the IRGC's headquarters in Damascus and killed multiple senior commanders; and the regular interdiction of weapons convoys traveling along the Damascus-Beirut highway. Israel rarely acknowledged specific strikes but made clear through diplomatic channels that it would not tolerate the establishment of an Iranian military presence in Syria.

The Fall of Assad (December 2024)

The collapse of the Assad regime in December 2024 represented one of the most dramatic geopolitical shifts in the modern Middle East and a devastating blow to the Axis of Resistance. A rapid offensive by Hayat Tahrir al-Sham (HTS) and allied rebel factions, launching from Idlib province, swept through Aleppo and advanced toward Damascus with stunning speed. The Syrian army, hollowed out by years of war and corruption, largely disintegrated. Iran's IRGC and Hezbollah forces, already weakened by Israel's 2024 campaign against Hezbollah and the broader strain of the multi-front war, were unable to mount an effective defense.

The fall of Damascus forced the remaining IRGC personnel to evacuate Syria and severed the overland corridor that had been the backbone of Iran's weapons pipeline to Hezbollah. This was arguably the most significant strategic loss Iran suffered in the entire post-October 7 escalation cycle. Without Syria, Iran lost its most reliable route for delivering heavy weapons to Lebanon, the IRGC lost its forward operating base in the Levant, and the Axis of Resistance lost its geographic contiguity.

Future Uncertainty

The post-Assad landscape in Syria remains deeply uncertain. The new authorities, led by HTS's Ahmad al-Sharaa (formerly Abu Mohammed al-Julani), have moved to establish control but face enormous challenges in governing a devastated country with multiple competing factions, ongoing Turkish and Kurdish tensions, and the continuing presence of ISIS remnants. For Iran, the loss of Syria necessitates a fundamental rethinking of its regional strategy. The land bridge that sustained Hezbollah's arsenal for decades is broken, and rebuilding it under a hostile Syrian government may prove impossible.

Iran has begun exploring alternative supply routes, including maritime paths through the Mediterranean (risky given Israeli naval dominance) and air routes over Iraq (dependent on Iraqi government cooperation and vulnerable to Israeli interception). However, none of these alternatives can replicate the volume and reliability of the overland corridor through Syria. The loss of the Syrian corridor may ultimately prove to be the most enduring strategic consequence of the 2023–2024 regional conflagration.

Primary Research Institutions

• Center for Strategic and International Studies (CSIS) — Transnational Threats Project, Iran proxy network analysis
• Institute for the Study of War (ISW) — Iran and Middle East threat updates, militia tracking
• Armed Conflict Location & Event Data Project (ACLED) — Conflict event data, proxy attack tracking
• Alma Center — Research and analysis on the Axis of Resistance and Hezbollah
• Long War Journal (Foundation for Defense of Democracies) — Militia profiles, IRGC operations
• International Crisis Group — Yemen, Lebanon, Iraq conflict analysis

Government and Military Sources

• US Congressional Research Service (CRS) — Reports on Iranian proxy forces and IRGC
• US Central Command (CENTCOM) — Press releases on militia attacks and responses
• US Treasury Department (OFAC) — Sanctions designations of proxy entities
• UK Ministry of Defence — Houthi Red Sea threat assessments
• IDF Official Statements — Northern border operations, Gaza campaign reports

Analytical and Academic Sources

• International Institute for Strategic Studies (IISS) — Armed Conflict Survey, Military Balance
• Brookings Institution — Middle East policy analysis, Iraq militia studies
• RAND Corporation — "Iran's Network of Influence" series
• Carnegie Endowment — Middle East Center, proxy dynamics research
• Stanford University — Mapping Militants Project
• Tel Aviv University INSS — Hezbollah, Hamas, and Axis of Resistance assessments

Open-Source Intelligence (OSINT)

• Bellingcat — Weapons tracing, geolocation of militia activities
• Conflict Armament Research (CAR) — Iranian weapons seizures and tracing
• Panel of Experts on Yemen (UNSC) — Iran weapons transfer documentation
• Jane's Defence — Militia capabilities and weapons specifications
• Planet Labs / Maxar Technologies — Satellite imagery analysis of militia positions