Yemen’s Iran-aligned Houthis said yesterday they were imposing a naval blockade on Saudi Arabia, a move that opens a new front against the United States in its war on Iran and widens the threat to global energy supplies and trade beyond the Gulf. Oil prices briefly rose after the Houthis’ statement but fell back due to traders’ hopes for a diplomatic breakthrough. The full closure of the strait would cut global oil supply by 7 percent as it would leave most Saudi oil exports unable to leave the region. The disruption would add to the massive cut to global oil flows from the war in the Gulf, which has already reduced shipments by 10 percent of global supply. Iranian President Masoud Pezeshkian yesterday said his country was in a “full-scale war” with the United States and that Tehran should accept the repercussions of the conflict.