Yemen's Iran-allied Houthis said Saudi Arabia was attacking the Yemeni capital Sanaa on Tuesday after a Saudi-led coalition warned civilians to stay away from an oil depot on the city's outskirts, part of a rapidly escalating war between the sides.

President Donald Trump’s deal for Russian diesel exposed the US to legal questions, opened a rift with his Republican allies and European leaders and heightened tensions with Ukraine — all in exchange for an outcome that experts suggest is unlikely to succeed.