Russia's President Vladimir Putin, left, shakes hands with Turkey's President Recep Tayyip Erdogan as he welcomes him prior to their meeting in Moscow, Russia, Monday, April 8, 2019. Russian President Vladimir Putin is hosting his Turkish counterpart, Recep Tayyip Erdogan, for talks expected to focus on the situation in Syria and their two nations' booming economic ties. (Presidential Press Service via AP, Pool)