Russian President Vladimir Putin (R) shakes hands with Turkish President Recep Tayyip Erdogan during their meeting in the Bocharov Ruchei residence in the Black Sea resort of Sochi in Sochi on September 17, 2018. - The leaders of the two countries that are on opposite sides of the conflict but key global allies will discuss the situation in Idlib at Putin's residence in the Black Sea resort city of Sochi. (Photo by Alexander Zemlianichenko / POOL / AFP)