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FILE - In this Monday, Sept. 4, 2017, file photo, trucks crosses the friendship bridge connecting China and North Korea in the Chinese border town of Dandong, opposite side of the North Korean town of Sinuiju. China has long been the Northís main trading partner and diplomatic protector. But Kim Jong Unís nuclear and missile tests have alienated Chinese leaders, who supported last monthís U.N. sanctions that slash North Korean revenue by banning sales of coal and iron ore. Beijing tried to head off the latest nuclear test, conducted Sunday, Sept. 3, 2017, by warning Pyongyang that such an event would lead to even more painful penalties. (AP Photo/Helene Franchineau, File)