Iran announced it was deploying a warship to the Red Sea after the US repelled an attack by the Tehran-aligned Houthi militias in Yemen on a container vessel. US helicopters repelled the attack, sinking three ships and killing 10 militants, according to accounts by American, Maersk, and Houthi officials on Sunday. Iran’s deployment of the Alborz is seen as an act of support to the Houthis, but it may deepen the tensions in the area and transform Yemen and its territorial waters into an arena of an international conflict.