Chinese President Xi Jinping (C, front) attends the closing session of the fourth Nuclear Security Summit in Washington D.C., the United States, April 1, 2016. (Xinhua/Zhang Duo)
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Chinese President Xi Jinping (C, front) attends the closing session of the fourth Nuclear Security Summit in Washington D.C., the United States, April 1, 2016. (Xinhua/Zhang Duo)
