Iran War Expands Across Lebanon, Iraq, and Yemen

The dimensions of the U.S.-Israeli war on Iran have expanded sharply, with multiple groups entering the conflict across Lebanon, Iraq, and Yemen. In southern Lebanon, Israeli ground operations have intensified, resulting in clashes with Hezbollah forces and the deaths of United Nations peacekeepers. The United Nations Interim Force in Lebanon (UNIFIL) confirmed that one of its peacekeepers was killed and another critically injured when a projectile struck a UN position near Adchit al Qusayr on March 30, 2026. Indonesia’s defense ministry identified the deceased as an Indonesian soldier, with three others wounded by indirect artillery fire. The UN Secretary-General called on all parties to respect international law and ensure the safety of UN personnel. UNIFIL reported that its positions have been hit multiple times since the fighting began on March 2, and three Ghanaian soldiers were previously wounded on March 7.

The Israeli Defense Forces (IDF) have shifted from limited incursions to a ground offensive in southern Lebanon, aiming to establish a 30-kilometer-deep security zone extending to the Litani River. Israeli troops have advanced along the western coastal highway and approximately 8 kilometers south of Tyre. The IDF has also conducted airstrikes on Beirut’s southern suburbs, including Haret Hreik and Burj al-Barajneh, claiming to target Hezbollah military sites. These operations have displaced more than 1.2 million people since early March, according to UN estimates.

Hezbollah has mounted a strong defense, using anti-tank guided missiles and drones to inflict losses on Israeli forces. On March 30, Hezbollah released footage showing the destruction of three Israeli Merkava tanks near Debl in southern Lebanon using Kornet or Iranian Dehlavieh missiles. The IDF confirmed that a soldier from the 401st Armored Brigade was killed and an officer seriously injured when an anti-tank missile struck their tank. Additional Israeli soldiers were wounded in separate incidents involving anti-tank missiles and a Hezbollah drone strike. The IDF acknowledged six soldiers killed in Lebanon since the start of the campaign, along with two Israeli civilian deaths from Hezbollah rocket fire. Despite these losses, Israeli officials have indicated that operations in Lebanon will continue even if a ceasefire is reached with Iran.

In Iraq, Popular Mobilisation Forces (PMF) have mobilized in support of Tehran. On March 30, Iranian and Iraqi media reported that a PMF convoy entered Iran from Basra through the Shalamcheh border crossing, described by Iranian media as a “humanitarian aid convoy” carrying 70 tonnes of food and medical supplies. The convoy was welcomed in Khuzestan province, where local clerics and officials greeted the fighters. The PMF, which is integrated into Iraq’s regular army, has previously claimed responsibility for attacks on U.S. interests and has been targeted by airstrikes in Iraq’s Anbar province. Unverified reports suggested that some PMF members were seen in Tehran, though Iranian authorities did not confirm this.

The same report indicated that the U.S. and Israel are preparing for potential ground incursions into Iran to seize strategic islands controlling the Strait of Hormuz. Washington has also considered using Kurdish armed groups based in Iraq to open a new front inside Iran, though logistical and political complications have delayed the plan. Iranian officials have warned that any Kurdish involvement would trigger strikes on all facilities in northern Iraq. The Islamic Revolutionary Guard Corps (IRGC) has already launched drone and missile attacks on Kurdish-linked sites in Iraq and other regional targets.

In Yemen, the Houthi movement has formally entered the war after weeks of threats. Over the weekend of March 29–30, the Houthis launched a missile attack on southern Israel, which analysts described as largely ineffective but symbolically significant. Experts warned that the Houthis could escalate by targeting the Bab al-Mandeb Strait, a critical chokepoint for global energy flows. The group has previously disrupted Red Sea shipping between 2023 and 2025, and recent movements toward Yemen’s southwest coast suggest preparations for renewed maritime attacks. The Bab al-Mandeb remains vital for rerouted Saudi oil exports—approximately 5 million barrels per day—after the Strait of Hormuz became partially blocked. Any Houthi disruption could halt nearly all tanker traffic to Asia and push oil prices far beyond the current $115 per barrel.

U.S. President Donald Trump stated on March 30 that if Iran does not reopen the Strait of Hormuz, the United States would destroy Iranian energy infrastructure, including Kharg Island and desalination plants. Analysts assessed that such threats could push the Houthis to intensify attacks on Red Sea shipping in coordination with Tehran’s broader strategy. The Houthis’ alignment with Iran remains strong despite their previous restraint toward Saudi Arabia, and their involvement marks a new escalation in the regional conflict.

The entry of Hezbollah, the PMF, and the Houthis into active combat transforms the Iran war from a bilateral confrontation into a multi-front regional conflict with global implications. Each front amplifies strategic pressure on U.S. and Israeli forces while threatening vital energy and trade routes. The simultaneous escalation in Lebanon, Iraq, and Yemen demonstrates Iran’s capacity to mobilize its “axis of resistance” as a deterrent network, complicating U.S. and Israeli military planning and stretching their operational bandwidth.

In Lebanon, the Israeli ground offensive and Hezbollah’s counterattacks illustrate the limits of conventional superiority when facing entrenched asymmetric forces. Hezbollah’s use of advanced anti-tank guided missiles and drones underscores the diffusion of precision strike capabilities among non-state actors. The group’s ability to inflict steady attrition on Israeli armor while maintaining command and control under bombardment suggests a high degree of operational resilience. The killing of UN peacekeepers and the displacement of over a million civilians also raise serious international law concerns, increasing diplomatic pressure on Israel and potentially constraining its freedom of action.

The Iraqi dimension highlights Tehran’s use of cross-border militias as both a political and military instrument. The PMF’s entry into Iran under the guise of humanitarian aid signals a blending of state and non-state logistics that complicates attribution and sanctions enforcement. The movement of armed convoys across the Iran-Iraq border demonstrates the permeability of regional frontiers and the consolidation of a transnational resistance network under IRGC coordination. The U.S. consideration of Kurdish proxies to open a northern front inside Iran further risks destabilizing Iraq’s fragile balance, potentially reigniting Kurdish-Arab tensions and inviting Iranian retaliation against U.S. positions in Iraq and Syria.

In Yemen, the Houthis’ reactivation of maritime threats at Bab al-Mandeb directly endangers global energy security. The Red Sea has become the only viable outlet for Gulf oil exports after partial closure of the Strait of Hormuz. Even limited Houthi attacks could paralyze shipping insurance markets, spike freight rates, and trigger cascading economic effects across Asia and Europe. The Houthis’ potential to coordinate with Iranian naval or cyber operations against maritime infrastructure introduces a new layer of hybrid warfare targeting global supply chains.

Strategically, the regionalization of the conflict undermines U.S. deterrence credibility. Despite extensive airstrikes, Washington faces expanding adversarial fronts and growing risks to its regional bases and naval assets. The Trump administration’s threats to destroy Iranian energy infrastructure may deter Tehran temporarily but also incentivize preemptive proxy escalation. The Houthis’ and Hezbollah’s actions demonstrate that Iran can impose costs on U.S. and Israeli interests without direct engagement, preserving plausible deniability while maintaining strategic depth.

Diplomatically, the deaths of UN peacekeepers and the humanitarian crisis in Lebanon could galvanize international calls for ceasefire and accountability under international law. However, the fragmentation of the conflict across multiple jurisdictions complicates enforcement mechanisms. The involvement of non-state actors blurs legal responsibility, while the targeting of civilian infrastructure risks war crimes allegations.

From an intelligence perspective, the conflict’s expansion increases the demand for integrated situational awareness across multiple theaters. Monitoring proxy movements, maritime threats, and cross-border logistics requires coordination among military, intelligence, and diplomatic channels. Cyber and electronic warfare are likely to play growing roles as both sides seek to disrupt command networks and communications.

Overall, the regional escalation marks a turning point in the Iran war, transforming it into a systemic crisis affecting global energy markets, alliance cohesion, and the credibility of international law. The conflict’s trajectory now depends on whether diplomatic channels can contain proxy warfare before it triggers a broader confrontation involving multiple great powers.