SOCHI, RUSSIA - NOVEMBER 22: Iranian President Hassan Rouhani (R) is welcomed by Russian President Vladimir Putin (L) ahead of the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia. ( Kayhan Özer - Anadolu Agency )
SOCHI, RUSSIA - NOVEMBER 22: Turkish President Recep Tayyip Erdogan (R) is welcomed by Russian President Vladimir Putin (L) ahead of the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia. ( Kayhan Özer - Anadolu Agency )
SOCHI, RUSSIA - NOVEMBER 22: Turkish President Recep Tayyip Erdogan (R) is welcomed by Russian President Vladimir Putin (L) ahead of the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia. ( Kayhan Özer - Anadolu Agency )
SOCHI, RUSSIA - NOVEMBER 22: Turkish President Recep Tayyip Erdogan (R) is welcomed by Russian President Vladimir Putin (L) ahead of the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia. ( Kayhan Özer - Anadolu Agency )
SOCHI, RUSSIA - NOVEMBER 22: Turkish President Recep Tayyip Erdogan (R), Russian President Vladimir Putin (C) and Iranian President Hassan Rouhani (L) pose for a photo ahead of the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia .
SOCHI, RUSSIA - NOVEMBER 22: Turkish President Recep Tayyip Erdogan (R), Russian President Vladimir Putin (C) and Iranian President Hassan Rouhani (L) pose for a photo ahead of the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia.
SOCHI, RUSSIA - NOVEMBER 22: National flags of Turkey, Russia and Iran are pictured during the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia. Turkish President Recep Tayyip Erdogan, Russian President Vladimir Putin and Iranian President Hassan Rouhani attend the meeting.
SOCHI, RUSSIA - NOVEMBER 22: Iranian President Hassan Rouhani attends the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia.
SOCHI, RUSSIA - NOVEMBER 22: Russian President Vladimir Putin attends the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia.
SOCHI, RUSSIA - NOVEMBER 22: Turkish President Recep Tayyip Erdogan, Russian President Vladimir Putin and Iranian President Hassan Rouhani attend the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia.
SOCHI, RUSSIA - NOVEMBER 22: Turkish President Recep Tayyip Erdogan, Russian President Vladimir Putin and Iranian President Hassan Rouhani attend the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia.
SOCHI, RUSSIA - NOVEMBER 22: Turkish President Recep Tayyip Erdogan (front C), Foreign Affairs Minister of Turkey Mevlut Cavusoglu (front R), Chief of the General Staff of the Turkish Armed Forces Hulusi Akar (front L) attend the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia.
SOCHI, RUSSIA - NOVEMBER 22: Turkish President Recep Tayyip Erdogan (C), Foreign Affairs Minister of Turkey Mevlut Cavusoglu (front R), Chief of the General Staff of the Turkish Armed Forces Hulusi Akar (L) attend the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia.
SOCHI, RUSSIA - NOVEMBER 22: Turkish President Recep Tayyip Erdogan, Russian President Vladimir Putin and Iranian President Hassan Rouhani attend the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia.
SOCHI, RUSSIA - NOVEMBER 22: Turkish President Recep Tayyip Erdogan, Russian President Vladimir Putin and Iranian President Hassan Rouhani attend the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia.
SOCHI, RUSSIA - NOVEMBER 22: Turkish President Recep Tayyip Erdogan, Russian President Vladimir Putin and Iranian President Hassan Rouhani attend the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia.
SOCHI, RUSSIA - NOVEMBER 22: Turkish President Recep Tayyip Erdogan, Russian President Vladimir Putin and Iranian President Hassan Rouhani attend the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia.
SOCHI, RUSSIA - NOVEMBER 22: Turkish President Recep Tayyip Erdogan (R), Russian President Vladimir Putin (C) and Iranian President Hassan Rouhani (L) hold a joint press conference following the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia. ( Sefa Karacan - Anadolu Agency )
SOCHI, RUSSIA - NOVEMBER 22: Turkish President Recep Tayyip Erdogan (R), Russian President Vladimir Putin (C) and Iranian President Hassan Rouhani (L) hold a joint press conference following the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia. ( Sefa Karacan - Anadolu Agency )
SOCHI, RUSSIA - NOVEMBER 22: Turkish President Recep Tayyip Erdogan (L), Russian President Vladimir Putin (C) and Iranian President Hassan Rouhani (R) are seen after the trilateral summit to discuss progress on Syria, between the Presidents of Turkey, Russia and Iran on November 22, 2017 in Sochi, Russia.