Houthis — Ansar Allah (Supporters of God)
Houthis — Ansar Allah (Supporters of God)
Iran-backed non-state armed group; designated terrorist organisation (US 2024); direct threat to NATO naval operations and global shipping; demonstrated anti-ship and anti-aircraft capability
Source: SIPRI / IISS / CRS
The Houthis (Ansar Allah) control northwest Yemen including Sanaa and the Red Sea coast. Since October 2023 they have attacked over 90 commercial vessels and conducted strikes on Israel using ballistic missiles, cruise missiles, and drone swarms — demonstrating the most advanced military capability ever exercised by a non-state armed group. Their attacks have disrupted ~15% of global shipping traffic, forcing major rerouting around the Cape of Good Hope at an estimated $10B+ in additional shipping costs.
The Houthi campaign against Red Sea shipping is unprecedented for a non-state actor and has demonstrated the ability to threaten NATO naval assets. Their use of ballistic missiles against Israel has been intercepted but forces continuous defensive expenditure of expensive interceptor missiles. US/UK strikes have degraded but not stopped their launch capability. They benefit from Iranian missile technology, ballistic missile expertise, and IRGC training.
Zaydi Shia political theology (Houthi ideology — Ansar Allah) combined with Yemeni nationalist grievance against Saudi intervention. The Red Sea campaign achieved more international visibility for Houthis in 12 months than 10 years of civil war. Iran's support has transformed their capability from insurgency to a force capable of threatening global shipping.
Control of Bab-el-Mandeb strait as strategic lever over global trade. Yemen reunification under Houthi political dominance. Coercive leverage over Saudi Arabia and UAE.
C-802 anti-ship missiles (Iranian-supplied). 17 Shaheed anti-ship loitering munition. 90+ ships struck or threatened since Oct 2023. Sea mines deployed.
Burkan-2H (modified Scud-C); Hatem 1/2; Toofan. Demonstrated range to Israel (~2,000 km). Used in saturation attacks requiring expensive interceptors.
Shahed-136/138 (Iranian-supplied loitering munitions). Samad-3 jet UAV. Waheid suicide boat. Large swarms employed vs. US/coalition naval assets.
~150,000–200,000 fighters. Combat experience from 9-year civil war. Significant resilience to air campaign attrition.
Man-portable air defence (MANPADS). Radar-guided AAA. Shot down US MQ-9 Reapers. Limited but demonstrated counter-air capability.
Quds-3 (derived from Iranian Soumar/Ya Ali). ~1,500 km range. Used in attacks on Israel and Saudi Arabia. Difficult to detect at low altitude.
| System | Type | Range | Payload | Guidance | CEP |
|---|---|---|---|---|---|
| Quds-1 / Quds-2 cruise missile | Land-attack cruise missile | 700–900 km | ~180 kg | INS + optical terminal | 5–10 m |
| Tankil / Badr-F ASBM | Anti-ship ballistic missile | 200–300 km | ~300 kg | Terminal optical/radar seeker | Improving — est. 10–20 m |
| Yafi-1 / Zulfiqar variant | Medium-range ballistic missile | ~2,000 km | ~400 kg | Advanced inertial + terminal | Classified |
Iranian design. Used in Abqaiq oil facility attack (2019). Regularly deployed against Saudi and UAE targets.
Extensively used in Red Sea campaign and against Israel.
Iranian-supplied. Used in attacks on Saudi/UAE airbases. Qasef-2K targets radar emitters.
Domestically labelled but Iranian-derived design.
Explosive-laden USVs; used in attacks on merchant shipping and Saudi naval vessels; innovation in asymmetric naval warfare
Multiple successful attacks on commercial shipping. Represents a new dimension in non-state naval capability.
Range ~120–170 km; sea-skimming terminal; active radar homing
Iranian-supplied coastal and ship-launched variant. Used against Red Sea shipping.
Limpet mines and contact mines deployed in Red Sea maritime lanes
Low-cost, high-impact threat to commercial shipping. Difficult to detect and clear.
Limited EW capability. GPS jamming of maritime navigation observed in Red Sea area. Commercial maritime navigation disruption documented.
Limited. IRGC-integrated intelligence support provides some surveillance of Red Sea shipping movements. AIS tracking used to identify target vessels.
GPS jamming (maritime). Commercial drone ISR for target identification. Iranian SIGINT support via IRGC. Assessment: limited traditional EW, but effective use of commercial technologies for targeting and navigation disruption.
Houthis began sustained anti-shipping campaign in Red Sea targeting vessels linked to Israel, US, and UK. Over 150 attacks against merchant shipping. ~15% of global container traffic rerouted around Cape of Good Hope.
US and UK conducted extensive air and naval strikes (Operation Prosperity Guardian expanded). 250+ strikes on Houthi launch sites, storage, and C2 infrastructure. Limited suppression of operational capability achieved.
Houthis claimed attack on USS Harry S. Truman carrier strike group with anti-ship ballistic missile. USN disputed impact but acknowledged the threat. First ASBM use against a carrier group in active operations.
Houthis fired Yafi-1 ballistic missile at Ben Gurion Airport, Tel Aviv. Intercepted by Arrow-3. Demonstrated 2,000 km range strike capability into Israeli heartland — longest-range Houthi strike on record.
Houthis announced "ceasefire" from US attacks in exchange for limiting attacks to Israel only. Ceasefire with US held through April-May 2025 while anti-Israel strikes continued.
Houthis will maintain symbolic strikes against Israel to sustain narrative credibility. Will test limits of the US ceasefire arrangement. Anti-shipping campaign partially suspended but infrastructure being maintained. Reconstituting launch capacity from US strikes.
Iran will continue weapons resupply, partially restoring depleted Quds-2 and ballistic missile stocks. Houthis will resume full anti-shipping campaign if Gaza conflict re-escalates. Internal Yemen dynamics remain complex — IRG (Saudi-backed) remains a competitor for political legitimacy.
COA 1: Maintain anti-Israel strikes for political narrative while conserving capability and resuming reconstruction.
COA 2: Resume full anti-shipping campaign when Iranian resupply restores stockpiles sufficiently.
COA 3: Use Red Sea ceasefire as political leverage for international recognition and Yemen negotiations.
Controls ~70% of Yemen's population. Sanaa airport and Hodeidah port under Houthi control. UN-recognised government (IRG) controls southeast. Houthis have become the internationally visible Yemeni actor through the Red Sea campaign.
Demonstrated ability to sustain multi-domain operations (UAV, missile, naval) despite extreme resource constraints. Drone and missile programme represents a technology leap beyond typical insurgent capability — enabled entirely by Iran.
Yemen is the world's worst humanitarian crisis. Houthis fund operations through taxation of humanitarian aid, fuel levies, and Iranian support (~$150-300M/year). No formal economic base.
Tribal society. Houthis maintain loyalty through ideology, coercion, and patronage. Red Sea campaign generated significant pan-Arab and Muslim sympathy during Gaza conflict. Deep support in Zaydi heartland (Saada province and surroundings).
Al-Masirah TV and extensive social media propaganda machinery. Successfully reframed Houthi identity from Yemen civil war faction to global resistance movement. Significant international sympathy in Muslim-majority populations.
Hodeidah port as critical leverage point — controls humanitarian supply and revenue. Sanaa airport control. Dispersed, hardened launch sites throughout mountainous northwest Yemen.
Yemen's mountainous terrain has historically defeated major external military interventions. Caves and tunnels provide operational security against airstrikes. Launch sites dispersed and hardened against precision strikes.
Houthis benefit from time — demonstrated ability to sustain operations over 10+ years of civil war. Time erodes international attention and resolve. Iranian resupply continuously replenishes depleted stocks.
Iranian weapons pipeline enabling asymmetric threat to global shipping — provides strategic leverage vastly disproportionate to Yemen's economic and military size.
Strategic direction from Iran; Houthi Military Council (led by Abd al-Khaliq al-Houthi) has operational autonomy particularly for Red Sea campaign. Iranian IRGC officers embedded with Houthi military planning. Political leadership (Abd al-Malik al-Houthi) in Sanaa.
Houthi strategy imposes economic costs on adversaries through maritime trade disruption rather than territorial conquest. Cheap Iranian-supplied drones, missiles, and mines hold high-value shipping at risk across a vast maritime area. The Red Sea campaign (2023–2025) is the most significant demonstration of this doctrine, showing that a sub-state actor with Iranian backing can effectively disrupt a major global trade chokepoint without triggering a decisive military response.
Sea denial zone extending 1,500+ km from Yemen using Samad-3 drones and Burkan missiles. Forces adversary naval vessels into sustained high-cost defensive posture. Fortified mountainous terrain in Yemen limits effectiveness of air campaigns against distributed launch sites.
The Red Sea campaign directly damages NATO European economies (energy imports, Suez trade) without triggering Article 5 — a successful sub-threshold economic coercion model. Sets precedent for proxy sea-denial operations as a template for Iranian strategy against Allied interests. Demonstrates that Alliance lacks a decisive response framework for proxy maritime coercion.
Systematic attacks on commercial shipping in the Red Sea and Gulf of Aden. Over 90 vessels struck or threatened. Forced global shipping rerouting adding ~14 days and $1M+ per voyage around Cape of Good Hope.
Iranian-supplied ballistic missile technology and IRGC technical advisers enabling expanded range and accuracy. Hatem-2 MRBM reaches all of Israel from Yemen.
Sea mines and explosive boats assessed as potential sub-surface threat. Iranian expertise in mine warfare being transferred.
Houthi forces deployed Iranian-derived Quds-class anti-ship cruise missiles (C-802/Noor derivatives) in their Red Sea campaign, striking multiple commercial vessels and warships from 2023 onwards. US Navy destroyers conducting intercepts recovered Iranian-manufactured components. The anti-ship capability — beyond anything Houthis could produce domestically — derives entirely from Iranian transfer. The campaign disrupted approximately 15% of global shipping through the Suez Canal.
UN Panel of Experts reports (S/2023/833 and preceding) document Iranian-origin components in Houthi ballistic missiles including propellant chemistry, guidance electronics, and structural elements matching Iranian Fateh-110 and Shahab designs. Supply runs via Yemen's western coast and smuggling networks. Despite international naval operations including Operation Prosperity Guardian, IRGC supply continued through 2024–2025 sustaining the Red Sea campaign.
Iran supplied Houthi forces with Samad-3 long-range fixed-wing attack drones (~1,500 km range) used in the September 2019 Abqaiq attack and throughout the 2023–2025 Red Sea campaign. Shahed-136-derived variants have also been supplied. UN experts confirmed Iranian components in recovered drone wreckage. The drones provide Houthis with a long-range strike capability against targets in Israel, Saudi Arabia, and the UAE far beyond domestic production capacity.
Houthis have demonstrated that a non-state actor can impose significant costs on global trade using relatively low-cost Iranian weapons. The Red Sea campaign has rerouted ~15% of global container shipping and added weeks to transit times, imposing $200Bn+ in additional freight costs annually. The ASBM threat to carrier strike groups is a new and serious strategic complication.