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Turkey's President Recep Tayyip Erdogan, right, and Russia's President Vladimir Putin, greets each other in Tehran, Iran, prior to their talks as part of Russia-Iran-Turkey summit to discuss Syria, Friday Sept. 7, 2018. Putin, Erdogan and Iran's President Hassan Rouhani began a meeting Friday in Tehran to discuss the war in Syria. (Kirill Kudryavtsev/Pool Photo via AP)