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Acting U.S. Defense Secretary Patrick Shanahan (L, Front) shakes hands with Polish Defense Minister Mariusz Blaszczak at the Pentagon in Arlington, the United States, on June 11, 2019. (Xinhua/Ting Shen)

Acting U.S. Defense Secretary Patrick Shanahan (L, Front) shakes hands with Polish Defense Minister Mariusz Blaszczak at the Pentagon in Arlington, the United States, on June 11, 2019. (Xinhua/Ting Shen)