
U.S. Secretary of State Rex Tillerson (center L) shakes hands with NATO Secretary General Jens Stoltenberg (center R) prior to a NATO Foreign Ministers meeting at its headquarters in Brussels, Belgium, March 31, 2017. (Xinhua/Ye Pingfan)

U.S. Secretary of State Rex Tillerson (center L) shakes hands with NATO Secretary General Jens Stoltenberg (center R) prior to a NATO Foreign Ministers meeting at its headquarters in Brussels, Belgium, March 31, 2017. (Xinhua/Ye Pingfan)