A suspected Houthi missile struck Riyadh airport on Saturday, killing 12 people of seven nationalities and wounding more than 300. It was the deadliest attack on a Gulf country since the US-Iran conflict began in March, and it has triggered a cascade of military commitments that could transform the Yemen war from a Saudi-led campaign into a multinational one. The dead include four Saudi citizens, two Bangladeshi nationals, a Palestinian, a US citizen, an Egyptian, a Jordanian, a Syrian, and a Sudanese. Among them: Azza Ramzy, a 28-year-old Egyptian flight attendant for Flynas, and Buthaina Ahmad Oweida, a 56-year-old Syrian widow and mother of four who had fled Idlib's civil war and was returning from a family visit. The airport remains closed. Schools are online until Thursday. The Houthis are not backing down. On Sunday the group warned airlines, passengers, and staff to stay away from Saudi airports entirely, declaring them "a theatre of operations" and promising "the worst is yet to come" if Saudi military action in Yemen continues. Saudi Arabia is already conducting airstrikes on Yemen — the Houthi government's health ministry claims 91 Yemeni deaths and 168 wounded over six weeks, 60% of whom it says were women and children. The real story is the widening circle of combatants. Trump said Saturday he was evaluating whether the US would join the military campaign, with 200 US military advisers already in-country providing intelligence and targeting. The UK committed to defensive support, specifically aerial refuelling for interceptor operations. On Monday, Saudi Arabia, Pakistan, and Turkey issued a joint statement accelerating deployment under their mutual defence pact. Saudi Arabia has also requested further assistance from France and Egypt — in part because its interceptor missile stocks are running low. Direct US involvement would mark a qualitative shift. The Houthis have signalled they would resume targeting shipping through the Bab al-Mandab strait, through which roughly 10% of global maritime goods transit. That threat connects the Yemen conflict directly to global energy and trade infrastructure at a moment when oil prices are already elevated from the broader US-Iran war. On the ground in Yemen, the Saudi-backed government launched a counteroffensive against recent Houthi territorial gains but has failed to dislodge the group from positions near the Bab al-Mandab strait, including Perim Island. The Houthis resisted years of coalition strikes after 2015 and show no signs of military fragility now. A 2022 UN-brokered ceasefire that had frozen frontlines collapsed after the Houthis launched a campaign to seize Yemen's Red Sea coast in September. The structural pattern is clear: each escalation — the Iran war, Houthi territorial advances, strikes on Saudi energy infrastructure, and now this airport attack — pulls more states into a conflict that no party has demonstrated the ability to win decisively. International condemnation from Guterres and von der Leyen frames this as regional destabilisation, but the decisions being made in Washington, London, Islamabad, and Ankara are military ones, not diplomatic ones.
