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U.S. Defense Secretary James Mattis (2nd R) arrives at the presidential palace in Vilnius, Lithuania, May 10, 2017. (Xinhua/Alfredas Pliadis)
U.S. Defense Secretary James Mattis (2nd R) arrives at the presidential palace in Vilnius, Lithuania, May 10, 2017. (Xinhua/Alfredas Pliadis)