Yemen's Houthi militant group has escalated its conflict with Saudi Arabia by announcing a blockade on Saudi shipping in a strategic waterway and attacking vessels. This move opens a new front between Iran and the United States.

Saudi Arabia has condemned the Houthi blockade, expressing concern over its impact on oil flow. The Houthis stated their action is based on the principle of 'an eye for an eye.' This comes as Iran's supreme leader warns the US of 'unforgettable lessons' amid alleged breaches.

Thousands of Houthi supporters rallied in Sanaa against the blockade. The US, meanwhile, approved nearly $2 billion in weapons sales to Saudi Arabia to bolster its air defence systems against the Iran-backed Houthis. Tensions have flared following an incident involving a diverted Iranian plane and strikes on Sanaa Airport, with the Houthis claiming responsibility for targeting Abha airport in retaliation.