David Cameron, U.K. prime minister, left, reacts as he talks with U.S. President Barack Obama, ahead of a flypast by the British Royal Air Force's (RAF) Red Arrows aerobatic team during the North Atlantic Treaty Organization (NATO) summit in Newport, U.K., on Friday, Sept. 5, 2014. Obama, after levying sharp criticism of Russian President Vladimir Putin and promising decisive action against Islamic State, is working to take advantage of growing international uneasiness to rally NATO into action. Photographer: Rowan Griffiths/Pool via Bloomberg
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