NATO Secretary General Jens Stoltenberg (L) talks with U.S. Defense Secretary James Mattis during the group photo session at a NATO Defence Ministers Meeting at its headquarters in Brussels, Belgium, Feb. 15, 2017. (Xinhua/Ye Pingfan)
NATO Secretary General Jens Stoltenberg (L) talks with U.S. Defense Secretary James Mattis during the group photo session at a NATO Defence Ministers Meeting at its headquarters in Brussels, Belgium, Feb. 15, 2017. (Xinhua/Ye Pingfan)
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