An undated U.S. Air Force handout photo of a RQ-4 Global Hawk unmanned aircraft

An undated U.S. Air Force handout photo of a RQ-4 Global Hawk unmanned aircraft

www.reuters.com

An undated U.S. Air Force handout photo of a RQ-4 Global Hawk unmanned aircraft.REUTERS/U.S. Air Force/Bobbi Zapka/Handout

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