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TEHRAN, IRAN - APRIL 7: Turkish President Recep Tayyip Erdogan (L) and Iran's President Hassan Rouhani (R) attend a joint media conference in Tehran, Iran on April 7, 2015. (Photo by Kayhan Ozer/Anadolu Agency/Getty Images)

TEHRAN, IRAN - APRIL 7: Turkish President Recep Tayyip Erdogan (L) and Iran's President Hassan Rouhani (R) attend a joint media conference in Tehran, Iran on April 7, 2015. (Photo by Kayhan Ozer/Anadolu Agency/Getty Images)