Turkish President Tayyip Erdogan poses with member countries' representatives during the 25th anniversary summit of the Organisation of the Black Sea Economic Cooperation (BSEC) in Istanbul, Turkey, May 22, 2017. The representatives are (L-R): Azerbaijan's Parliament Speaker Oktay Asadov, Greek President Prokopis Pavlopoulos, Turkish President Tayyip Erdogan, Moldovan President Igor Dodon, Turkish Prime Minister Binali Yildirim and Russian Prime Minister Dmitry Medvedev. REUTERS/Murad Sezer