Turkey has threatened to restart its military offensive if the Kurdish fighters do not fully withdraw from a predetermined area along Syria’s northern border with Turkey by Tuesday evening. If the withdrawal is completed, Ankara has agreed to permanently halt its offensive, which is aimed at creating a vast buffer zone for Turkey along much of its border with Syria.  
Erdogan’s meeting with Putin, the Syrian government’s most powerful supporter, was widely expected to center on the thorny aftermath of Turkey’s military operation and the rapidly shifting Syrian map of control, as U.S. troops withdraw and competing factions rush to fill the void.