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Turkish President Recep Tayyip Erdogan, Russian President Vladimir Putin, German Chancellor Angela Merkel, French President Emmanuel Macron, take part in a meeting during the "Four-day Istanbul summit on Syria", at Vahdettin Mansion in Istanbul, on October 27, 2018. - The leaders of Turkey, Russia, France and Germany are set to meet in Istanbul to try to find a lasting political solution to the Syrian civil war and salvage a fragile ceasefire in a rebel-held northern province. Turkish President will host Russian President, French President and German Chancellor for the summit on the conflict, in which more than 360,000 people have been killed since 2011. (Photo by Mikhail KLIMENTYEV / POOL / AFP) (Photo credit should read MIKHAIL KLIMENTYEV/AFP via Getty Images)