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NEWPORT, WALES - SEPTEMBER 5: Turkish President Recep Tayyip Erdogan (L) meets with US President Barack Obama (R) on day two of the 2014 NATO Summit in Newport, Wales, on September 5, 2014. World leaders gather for a two-day NATO summit taking place on September 04-05 in Newport. (Photo by Kayhan Ozer/Anadolu Agency/Getty Images)

NEWPORT, WALES - SEPTEMBER 5:  Turkish President Recep Tayyip Erdogan (L) meets with US President Barack Obama (R) on day two of the 2014 NATO Summit in Newport, Wales, on September 5, 2014. World leaders gather for a two-day NATO summit taking place on September 04-05 in Newport. (Photo by Kayhan Ozer/Anadolu Agency/Getty Images)