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ANKARA, TURKEY - APRIL 3: (RUSSIA OUT) Russian President Vladimir Putin (L) shakes hands with Turkish President Recep Tayyip Erdogan during their joint press conference at the presidential palace on April 3, 2018 in Ankara, Turkey. Russian President Vladimir Putin is having a two-days state visit to Turkey. (Photo by Mikhail Svetlov/Getty Images)

ANKARA, TURKEY - APRIL 3: (RUSSIA OUT) Russian President Vladimir Putin (L) shakes hands with Turkish President Recep Tayyip Erdogan during their joint press conference at the presidential palace on April 3, 2018 in Ankara, Turkey. Russian President Vladimir Putin is having a two-days state visit to Turkey. (Photo by Mikhail Svetlov/Getty Images)