U.S. Secretary of State Rex Tillerson, left, shakes hands with NATO Secretary General Jens Stoltenberg during a meeting of the North Atlantic Council at NATO headquarters in Brussels on Friday, March 31, 2017. U.S. Secretary of State Rex Tillerson meets with his NATO counterparts in Brussels for the first time looking to persuade reluctant allies to increase defense spending and do more to combat terrorism. (AP Photo/Virginia Mayo)
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