The growing partnership between Yemen’s Houthi rebels and Somalia’s al-Shabaab militants has raised concerns among U.S. officials and regional experts about escalating threats to stability in the Horn of Africa and the security of vital maritime routes. The alliance, which includes weapons transfers, joint training in drone and explosives use, and increased movement across southern Somalia, signals a significant expansion of influence for both groups on either side of the Gulf of Aden.
The Houthis, an Iran-backed group engaged in a protracted conflict in Yemen, have recently consolidated control along the Red Sea coast, capturing the strategic port of Mocha and advancing toward the Bab al-Mandeb strait. This narrow passage is a crucial maritime chokepoint through which roughly 10% of global trade passes. Through their links to al-Shabaab, a Sunni extremist group and al-Qaeda affiliate that controls approximately 40% of Somalia’s territory, the Houthis are gaining operational access on the African side of the Gulf of Aden.
U.S. Africa Command described the connection as a “highly concerning, escalatory threat to regional stability.” The alliance could enable al-Shabaab to extend its operational reach across the Horn of Africa, while providing the Houthis with additional means to influence and disrupt maritime corridors in the Red Sea and western Indian Ocean.
Somali security officials remain cautious about the implications for a country long plagued by conflict, where al-Shabaab maintains a fragile balance of power with the government in Mogadishu. Experts note that the partnership initially revolved around transactional activities, including arms smuggling, taxation, and extortion. Al-Shabaab reportedly generates at least $120 million annually from illicit operations, with some analysts estimating the actual figure to be much higher, positioning the group among the wealthiest al-Qaeda affiliates.
Conversely, the Houthis possess access to advanced Iranian weaponry and have developed their own missile and drone capabilities. Their relationship with al-Shabaab is evolving beyond smuggling to include the exchange of technical expertise and weapon systems, raising concerns about the potential spread of sophisticated arms in the region.
Security analysts highlight that the immediate threat remains focused on the Red Sea and Gulf of Aden, where Houthi attacks on shipping have increased following their stated solidarity with Palestinians after the Hamas attack in October 2023. However, there is apprehension that if al-Shabaab gains proficiency in operating medium-range missiles and drone boats supplied by the Houthis, the destabilizing effects could extend into the wider western Indian Ocean.
In addition to militant activity, piracy off Somalia’s northern coast has surged, with attacks reaching a decade-high this year, including the recent seizure of a Turkish vessel transporting weapons destined for Mogadishu.
Veteran Somalia analyst Matt Bryden, formerly head of the UN Security Council panel of experts on Somalia, estimated that up to 1,500 Somali fighters from al-Shabaab and other factions have trained with the Houthis in Yemen. He noted that al-Shabaab had sought advanced Iranian weapons such as S358 surface-to-air missiles, though such systems have yet to appear in Somali conflict zones, possibly due to interception efforts.
Houthi delegations have increased visits to al-Shabaab’s stronghold in Jilib, southern Somalia, reportedly installing radar and surveillance equipment to monitor maritime traffic from the African coast. This collaboration reflects a strategic attempt by the Houthis to exert control over critical shipping lanes by applying pressure on both sides of the Gulf of Aden.
The expanding Houthi-al-Shabaab nexus presents a complex challenge to regional security, threatening to disrupt global shipping routes and exacerbate instability in an already volatile region. U.S. and regional actors continue to monitor the situation closely as the alliance deepens and its operational capabilities grow.