Russian President Vladimir Putin is expected to host his Turkish counterpart, Recep Tayyip Erdogan on Monday to discuss peace efforts for Syria's Idlib region, where a major Syrian government offensive against a rebel stronghold appears imminent.
Russia, the main military backer of the Syrian government, has so far agreed with rebel-sympathetic Turkey that groups recognized as terrorist organizations are not included in ceasefire efforts.
Turkey has repeatedly warned of the grave humanitarian crisis that could erupt should Assad mount his assault on the rebel enclave.
Situated near the Turkish border in Syria's north-west, Idlib is the last remaining rebel stronghold after seven years of the devastating conflict in the country.
As Syrian state forces were poised to invade Idlib, Russia accused militants of conducting attacks and said it was preparing humanitarian corridors to evacuate civilians.
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