FRANKFURT, Germany (AP) — The U.S. Navy is imposing a sea blockade against Iran — the latest escalation in the war that has seen the flow of key energy supplies choked off at the Strait of Hormuz. The blockade that started Monday “has been fully implemented,” according to a statement Wednesday from Adm. Brad Cooper, commander of the U.S. Central Command. In the blockade’s first 36 hours, “U.S. forces have completely halted economic trade going in and out of Iran by sea,” he said. The blockade