U.S. Weighs Joining Saudi Campaign Against Houthis as Red Sea Conflict Spillover Risks Rise

The United States is weighing direct involvement in Saudi Arabia's military campaign against Yemen's Houthis, which would mark another significant spillover of conflict since the broader war launched by the United States and Israel against Iran in February 2026. According to the Australian Broadcasting Corporation (ABC), Riyadh International Airport in the Saudi capital was struck on the 9th, killing 13 people and wounding more than 300 — the deadliest attack Saudi Arabia has suffered in over a decade. Houthi military spokesman Yahya Saree claimed the group had carried out four 'qualitative operations' over the past 24 hours against Riyadh airport, Dammam airport, and two facilities of Saudi state oil company Aramco, using ballistic missiles, cruise missiles, and drones.

Saudi officials confirmed the same day that Riyadh airport had been struck again, killing one person and wounding 11. Saudi Arabia has extended the airport's closure until at least 9 p.m. local time on Sunday evening and ordered schools in the capital to switch to online instruction for the remainder of the week. Indian authorities confirmed that an Indian citizen injured in the Riyadh airport attack had died, raising the death toll from that attack to 13. The Australian Embassy in Saudi Arabia has instructed Australian citizens in Riyadh to shelter in place.

The day after the attack, the Houthi-run foreign ministry warned, via its affiliated Al Masirah television channel, airlines, airport staff, and travelers to stay away from Saudi airports and airspace on the grounds that these targets 'are vulnerable to attack and have become battlegrounds for our operations,' with the exception of airports in the holy cities of Mecca and Medina. The statement also warned: 'Unless the Saudi enemy ceases its aggression and interference in Yemen, worse is yet to come, God willing.' The Houthis stressed that their subsequent operations would be guided by the 'principle of reciprocity.'

U.S. President Trump publicly stated on Saturday that the United States is considering joining Saudi Arabia's campaign against the Houthis. The same day, the U.S. Federal Aviation Administration notified U.S. carriers to exercise caution when flying to, from, or over Saudi Arabia, citing 'security threats and navigation system interference associated with ongoing military activity,' with the advisory in effect until December 10. The agency said the relevant threats 'could pose potential risks to aircraft at all altitudes — including during overflight, takeoff, and landing phases.'

Amid a dense wave of international condemnation, the civilian casualties inflicted by the Saudi-led coalition inside Yemen have not received comparable attention. Data released by the Houthi-run health ministry showed that coalition airstrikes over the past five weeks have killed 91 Yemenis and wounded 168, 60 percent of them women and children. U.N. Secretary-General Guterres wrote on the social platform X: 'Attacks on civilians and civilian infrastructure violate international law and must stop immediately.' Yet the same words have not, to date, been used to demand that the Saudi-led coalition halt its ongoing strikes on Yemen. European Commission President von der Leyen, by contrast, blamed 'Iran's proxies' for the attacks, saying they 'are pushing the region into a maelstrom of violence and disrupting critical global transport and energy nodes.'

The Houthis also reported on Sunday that Sana'a International Airport in the Yemeni capital had been struck by Saudi airstrikes, a report confirmed by the Houthi-controlled Al Masirah television channel. Saudi authorities had not responded by the time of writing, nor had they immediately released casualty figures.

Officials from Iraq, Lebanon, Syria, the United Arab Emirates, Germany, the United Kingdom, Turkey, Pakistan, Russia, and other countries have issued strongly worded statements of condemnation one after another. German Foreign Minister Wadephul characterized the attacks as 'acts of terrorism' directed at Saudi Arabia and civil aviation; British Defence Secretary Streeting called them a 'despicable dangerous escalation'; and the UAE expressed support for 'all measures' taken by Saudi Arabia to safeguard its national security. Yet for these very same voices issuing such dense statements, the Houthi-released figure of 91 Yemeni civilians killed over five weeks, six in ten of them women and children, has scarcely drawn corresponding condemnation or calls for accountability.

The extent of concrete command-and-supply ties between the Houthis and Iran, and whether the U.S. side will ultimately decide to enter the fight, currently lack official confirmation from any party.