WASHINGTON (Reuters) -The top U.S. general in Europe told Congress on Wednesday that Ukraine will run out of artillery shells and air defense interceptors "in fairly short order" without U.S. support, leaving them vulnerable to a partial or total defeat. In a sign of how scarce some weapons were, General Christopher Cavoli, commander of European Command, told the House Armed Services Committee that Russia was currently firing five artillery shells for every one fired by Ukrainian forces and that