Houthi Missile & Drone Arsenal: Iran-Supplied Weapons Threatening Red Sea Shipping
The Houthis (Ansar Allah) operate the most advanced non-state missile and drone arsenal in the world, supplied primarily by Iran. Their inventory includes Toufan ballistic missiles (1,900+ km range), Quds cruise missiles (~800 km), anti-ship ballistic missiles (Tankil/Asef), and hundreds of Shahed-136 one-way attack drones. Since late 2023, they have conducted over 100 attacks on Red Sea shipping, forcing major carriers to reroute around Africa and adding $1M+ per transit in war risk insurance. The US Navy has spent over $1 billion intercepting Houthi projectiles using SM-2, SM-6, and ESSM missiles costing $1-5M each to stop weapons costing $2,000-$50,000.
Definition
The Houthi movement (Ansar Allah) is a Zaidi Shia political and military organization controlling much of northern Yemen, including the capital Sanaa. Since 2015, the Houthis have received extensive weapons transfers from Iran, transforming from a guerrilla force armed with small arms and unguided rockets into an organization capable of threatening international shipping and striking targets over 1,900 km away. Their arsenal now includes ballistic missiles, cruise missiles, anti-ship missiles, and advanced drones that have been used to attack Saudi Arabia, the UAE, and commercial shipping in the Red Sea, Bab el-Mandeb strait, and the Gulf of Aden.
Why It Matters
The Houthis have demonstrated that a non-state actor armed with relatively inexpensive Iranian weapons can disrupt global commerce and impose disproportionate costs on advanced military forces. The cost-exchange ratio is staggering: a $2,000 Shahed-136 drone is intercepted by a $2-5 million SM-2 or SM-6 missile. Their Red Sea campaign has caused an estimated 10-15% increase in global shipping costs, rerouted approximately 15% of world trade around the Cape of Good Hope, and forced the US Navy to expend irreplaceable interceptor stocks at an unsustainable rate. In the broader Iran conflict, the Houthis represent a southern front that diverts coalition naval assets and interceptor inventory away from the primary Iranian theater.
How It Works
Iran transfers weapons to the Houthis through a maritime smuggling network that uses dhows and fishing vessels to deliver missile components, drones, and technical expertise via the Arabian Sea and Gulf of Aden. Components are shipped disassembled to avoid detection, then assembled in Yemen by Iranian technical advisors. The IRGC Quds Force manages the supply chain, while Hezbollah has reportedly provided some training. The Houthis operate from mobile launchers in Yemen's mountainous terrain, making targeting difficult for coalition airstrikes. Their targeting of commercial vessels uses a combination of Iranian-supplied coastal surveillance radar, commercial AIS (Automatic Identification System) data, and intelligence from sympathetic port workers to identify and track high-value shipping.
Ballistic Missiles: Toufan and Extended-Range Variants
The Houthis' most capable ballistic missiles are the Toufan family — assessed to be derivatives of Iranian Shahab and Qiam designs. The Toufan-1 has a range of approximately 1,000 km, while the Toufan-2 reportedly extends to 1,900+ km — sufficient to reach central Israel. These missiles use liquid propellant and carry conventional warheads of 500-750 kg. The Houthis have also deployed the Burkan-2 (Scud-variant, ~1,000 km), used in strikes against Riyadh's King Khalid International Airport. More recently, the Hatem and Palestine-2 missiles — likely Iranian-assisted designs — have been used against Israeli targets with claimed ranges exceeding 2,000 km. While accuracy is limited (CEP estimated at 1-5 km), these missiles force expensive intercepts by Arrow, THAAD, and SM-3 systems.
- Toufan-2: 1,900+ km range — capable of reaching Israel from Yemen (1,800 km direct)
- 500-750 kg conventional warheads — inaccurate but force expensive Arrow/THAAD/SM-3 intercepts
- Derived from Iranian Shahab/Qiam designs — assembled in Yemen with Iranian technical support
Anti-Ship Missiles: The Red Sea Threat
The Houthis have deployed multiple anti-ship missile types against commercial and military vessels in the Red Sea. The Tankil (likely derived from the Iranian Khalij-e Fars ASBM) is an anti-ship ballistic missile designed to hit moving vessels using terminal electro-optical guidance. The Asef is another ASBM variant. Cruise missile types include derivatives of the Iranian Quds cruise missile (itself based on Soviet Kh-55 technology) with ranges of 700-800 km and terminal anti-ship seekers. These weapons have struck or damaged multiple commercial vessels since November 2023, including the Galaxy Leader (seized), the MV Rubymar (sunk), and several container ships and tankers struck by missile fragments or near-misses. The threat has forced major shipping lines (Maersk, Hapag-Lloyd, MSC) to reroute around Africa, adding 10-14 days to Asia-Europe voyages.
- Tankil/Asef anti-ship ballistic missiles with terminal guidance — designed to hit moving ships
- Quds cruise missile variants: 700-800 km range with anti-ship seeker for over-the-horizon targeting
- Multiple commercial vessels struck or damaged — major shipping lines rerouted around Africa
Drone Warfare: Shahed-136 and One-Way Attack UAVs
Drones form the highest-volume component of Houthi attacks. The Shahed-136 (called Samad by Houthis) is an Iranian-designed one-way attack drone with a range of approximately 2,500 km, carrying a 40-50 kg warhead. At an estimated production cost of $2,000-$5,000, it represents the most extreme cost-exchange challenge for defenders — each intercept by a $2 million SM-2 or $5 million SM-6 missile costs 400-2,500x more than the threat. The Houthis have also deployed larger drones including the Sammad-3 with claimed ranges exceeding 1,700 km and the Waid with terminal guidance for anti-ship operations. In mass raids combining drones with ballistic and cruise missiles, the drones serve as saturation weapons designed to exhaust defensive interceptors before the more lethal missile components arrive.
- Shahed-136 drones: $2,000-$5,000 each vs $2-5M per interceptor — worst cost-exchange ratio in modern warfare
- 2,500 km range with 40-50 kg warhead — can reach targets well beyond Yemen's borders
- Used in combined raids with missiles — drones saturate defenses before the main missile strike arrives
Cost to Defend: The US Navy's Interceptor Problem
Since the Houthi campaign intensified in late 2023, the US Navy has expended hundreds of SM-2, SM-6, and ESSM interceptors shooting down Houthi drones and missiles — at a cost exceeding $1 billion. USS Carney, USS Mason, USS Gravely, and other destroyers have fired hundreds of missiles in defensive engagements. Each SM-2 costs approximately $2.1 million, SM-6 approximately $4.9 million, and ESSM approximately $1.1 million. Against Houthi weapons costing $2,000-$50,000, the cost-exchange ratio ranges from 22:1 to 2,500:1 in the Houthis' favor. More critically, these interceptors draw from the same finite US Navy stockpile needed for potential engagements against Iran's direct missile forces and for Pacific theater deterrence against China. Every SM-6 fired at a Houthi drone is one fewer available for the primary Iranian or Indo-Pacific mission.
- US Navy has spent $1B+ intercepting Houthi weapons since late 2023
- Cost-exchange ratio: 22:1 to 2,500:1 in Houthi favor — strategically unsustainable
- Interceptors come from same stockpile needed for Iran and Indo-Pacific — zero-sum depletion
Frequently Asked Questions
What missiles do the Houthis have?
The Houthis operate ballistic missiles (Toufan, Burkan, Palestine-2 with ranges up to 2,000+ km), cruise missiles (Quds variants, 700-800 km range), anti-ship ballistic missiles (Tankil, Asef), and one-way attack drones (Shahed-136/Samad with 2,500 km range). All are supplied by Iran through maritime smuggling networks and assembled in Yemen with Iranian technical assistance.
How far can Houthi missiles reach?
The longest-range Houthi missiles (Toufan-2, Palestine-2) can reach approximately 1,900-2,000+ km — sufficient to strike Israel from Yemen (approximately 1,800 km). Houthi Shahed-136 drones have even greater range at approximately 2,500 km. Shorter-range anti-ship missiles and cruise missiles (700-800 km) threaten shipping throughout the Red Sea, Bab el-Mandeb, and Gulf of Aden.
How much does it cost to shoot down a Houthi drone?
Each Houthi Shahed-136 drone costs an estimated $2,000-$5,000 to produce. The US Navy intercepts them using SM-2 missiles ($2.1 million each), SM-6 missiles ($4.9 million each), or ESSM ($1.1 million each). This creates a cost-exchange ratio of 220:1 to 2,500:1 in the Houthis' favor — one of the most extreme economic asymmetries in the history of modern warfare.
Where do the Houthis get their weapons?
Iran is the primary weapons supplier to the Houthis. The IRGC Quds Force manages a maritime smuggling network using dhows and fishing vessels to deliver disassembled missile components, drone kits, and technical expertise through the Arabian Sea and Gulf of Aden. Iranian engineers help assemble weapons in Yemen. Hezbollah has also reportedly provided training. UN Panel of Experts reports have documented Iranian weapon components recovered from seized shipments.
Have Houthi attacks affected shipping costs?
Yes, dramatically. Houthi Red Sea attacks have caused a 10-15% increase in global shipping costs, with war risk insurance premiums exceeding $1 million per transit for large vessels. Major carriers (Maersk, MSC, Hapag-Lloyd) rerouted around Africa's Cape of Good Hope, adding 10-14 days to Asia-Europe voyages. Container freight rates from Asia to Europe approximately doubled during peak attack periods. The disruption affects approximately 15% of global trade that normally transits the Red Sea and Suez Canal.