TOPSHOT - Russia's President Vladimir Putin (L) shakes hands with his Turkey's counterpart Recep Tayyip Erdogan during their meeting in Tehran on September 7, 2018. - The presidents of Iran, Russia and Turkey meet in Tehran for a summit set to decide the future of Idlib province amid fears of a humanitarian disaster in Syria's last major rebel bastion. (Photo by Kirill KUDRYAVTSEV / POOL / AFP)