A Chinese tour boat sails past the Friendship Bridge linking between China and North Korea, in Dandong, China Wednesday, Feb. 13, 2013. Defying U.N. warnings, North Korea on Tuesday conducted its third nuclear test in the remote, snowy northeast, taking a crucial step toward its goal of building a bomb small enough to be fitted on a missile capable of striking the United States. (AP Photo/Aritz Parra)
