In this Feb. 7, 2013 file photo, the Friendship Bridge, left, linking 

In this Feb. 7, 2013 file photo, the Friendship Bridge, left, linking China and North Korea, and the Yalu River Bridge, right, which was bombed in the 1950's during the Korean War, are seen before daybreak in Dandong, China, opposite the North Korean border town of Sinuiju. China’s patience with North Korea is wearing thin, and a widely-expected nuclear weapons test by the latter could bring that frustration to a head. Beijing signaled its growing unhappiness by agreeing to tightened U.N. sanctions after North Korea launched a rocket in December, eliciting harsh criticism from Pyongyang and comment from China watchers surprised by Beijing’s unusually tough line. (AP Photo/Eugene Hoshiko)
Associated Press
In this Feb. 7, 2013 file photo, the Friendship Bridge, left, linking China and North Korea, and the Yalu River Bridge, right, which was bombed in the 1950's during the Korean War, are seen before daybreak in Dandong, China, opposite the North Korean border town of Sinuiju. China’s patience with North Korea is wearing thin, and a widely-expected nuclear weapons test by the latter could bring that frustration to a head. Beijing signaled its growing unhappiness by agreeing to tightened U.N. sanctions after North Korea launched a rocket in December, eliciting harsh criticism from Pyongyang and comment from China watchers surprised by Beijing’s unusually tough line. (AP Photo/Eugene Hoshiko)
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