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The NATO flag is seen through barbed wire as it flies in front of the new NATO Headquarters in Brussels, Belgium May 24, 2017. Member nations will inaugurate the new NATO headquarters during a summit in Brussels, Belgium May 25, 2017. REUTERS/Christian Hartmann – RC1119E4BBA0

The NATO flag is seen through barbed wire as it flies in front of the new NATO Headquarters in Brussels, Belgium May 24, 2017. Member nations will inaugurate the new NATO headquarters during a summit in Brussels, Belgium May 25, 2017. REUTERS/Christian Hartmann - RC1119E4BBA0