text:  Washington and Moscow have clashed before over U.S. drones in the Black Sea. Today's statement by Russia follows a Ukrainian attack on Crimea's largest city last weekend, with U.S.-made missiles, which Russia claims killed four and injured 150. I'm Donna Water. That on Wall Street, stocks have moved lower. The Dow losing 70 points, the Nasdaq 17 points in the red. More on these stories at townhall.com.