Four-way Istanbul summit on SyriaOBER 27: President of Turkey, Recep Tayyip Erdogan (R) shakes hands with German Chancellor Angela Merkel (L) ahead of the ''Four-way Istanbul summit on Syria'' at Vahdettin Mansion in Istanbul, Turkey on October 27, 2018.

ISTANBUL, TURKEY - OCTOBER 27: President of Turkey, Recep Tayyip Erdogan (R) shakes hands with German Chancellor Angela Merkel (L) ahead of the ''Four-way Istanbul summit on Syria'' at Vahdettin Mansion in Istanbul, Turkey on October 27, 2018. The summit on Syria, hosted by Turkish President Recep Tayyip Erdogan, will see the participation of Russian President Vladimir Putin, German Chancellor Angela Merkel, and French President Emmanuel Macron. ( Kayhan Özer - Anadolu Agency )

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