North Korean military personnel are seen on patrol boats on Yalu River near the North Korean town of Sinuiju, opposite the Chinese border city of Dandong, March 29, 2013. China called for an easing of tensions on Friday as North Korea put its missile units on standby to attack U.S. military bases in South Korea and the Pacific after the United States flew two nuclear-capable stealth bombers over the Korean peninsula. REUTERS/Jacky Chen | Foto: Reuters