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ISTANBUL, Oct. 27, 2018 @Xinhua:Maxppp - German Chancellor Angela Merkel, Russian President Vladimir Putin, Turkish President Recep Tayyip Erdogan and French President Emmanuel Macron (from L to R) attend a joint press conference following the four-way summit on Syria in Istanbul, Turkey, on Oct. 27, 2018. Turkish President Recep Tayyip Erdogan on Saturday said the four-way summit ended with a call for a full-scale cease-fire to halt the bloodshed in Syria