North Atlantic Treaty Organization (Nato)

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U.S. Air Force Gen. Philip Breedlove, the Supreme Allied Commander in Europe, second left, speaks to colleagues during a meeting of the North Atlantic Council with Non-NATO ISAF Contributing Nations at NATO headquarters in Brussels on Wednesday, April 2, 2014. (AP Photo/Virginia Mayo)

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U.S. Air Force Gen. Philip Breedlove, the Supreme Allied Commander in Europe, second left, speaks to colleagues during a meeting of the North Atlantic Council with Non-NATO ISAF Contributing Nations at NATO headquarters in Brussels on Wednesday, April 2, 2014. (AP Photo/Virginia Mayo)

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U.S. Air Force Gen. Philip Breedlove, left, the Supreme Allied Commander in Europe, speaks to colleagues during a meeting of the North Atlantic Council with Non-NATO ISAF Contributing Nations at NATO headquarters in Brussels on Wednesday, April 2, 2014. (AP Photo/Virginia Mayo)