When Joe Biden gave the order for airstrikes on Houthi targets in Yemen, he was taking a step that now imperils one of the primary aims of his own Middle East policy – to prevent a regional war.
US and allied officials argue he had little choice. Diplomacy, back-door channels, signalling and threats had failed to halt relentless Houthi attacks on shipping in the Red Sea and Gulf of Aden, which the Iranian-backed group has claimed are being carried out in solidarity with Gaza.