The U.S. military said on Thursday a blast on Sunday near a UNESCO world heritage site in Yemen's capital city of Sanaa was caused by a Houthi missile and not an American airstrike.

U.S. officials will meet in London this week with European and Ukrainian negotiators to discuss the latest American proposals to end the conflict.

Russia said on Monday it was waiting for a signal from Ukraine regarding Kyiv's willingness to hold direct negotiations to end the war, but said it did not so far see any signs of movement. The Kremlin said last Friday that the possibility of direct talks between the two sides had been raised during a three-hour meeting between President Vladimir Putin and U.