The Washington Post reports the U.N. Security Council on Tuesday imposed an arms embargo on Yemen’s Houthi rebels and their supporters, in a move that further isolates the insurgents but may have only a limited effect on the fighting in the impoverished country. The resolution passed 14-0, with Russia abstaining. It was approved three weeks after Saudi Arabia launched airstrikes in its neighbor to weaken the rebels, who have taken control of Yemen’s capital and other key sites. Saudi Arabia and its allies in the military offensive claim the mostly Shiite insurgents are backed by Shiite power Iran. The Iranian government denies it has a direct hand in the conflict.The attacks by Arab warplanes have failed so far to significantly drive back the rebels as Yemen sinks deeper into a humanitarian crisis.