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NATO Secretary General Jens Stoltenberg (L, Front) shakes hands with U.S. Secretary of State Mike Pompeo during a family photo session of NATO foreign ministers' meeting in Brussels, Belgium, on Dec. 4, 2018. (Xinhua/Ye Pingfan)

NATO Secretary General Jens Stoltenberg (L, Front) shakes hands with U.S. Secretary of State Mike Pompeo during a family photo session of NATO foreign ministers' meeting in Brussels, Belgium, on Dec. 4, 2018. (Xinhua/Ye Pingfan)