A soldier stands guard near a barbed wire fence on Hwanggumpyong Island located in the middle of the Yalu River, near the North Korean town of Sinuiju and 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. The Chinese characters on the signboard read "restricted areas in ports, entry not allowed if no border permission." REUTERS/Jacky Chen | Foto: Reuters