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A look at what's next for the major players in Syria's war

The U.S., Russia and more than a dozen other countries met Thursday in Munich to discuss halting the fighting in Syria, while forces of President Bashar Assad are making some of their biggest gains against the opposition.

The fighting around Syria's largest city of Aleppo has brought government forces closer to the Turkish border than at any point in recent years, routing rebels from key areas and creating a humanitarian disaster as tens of thousands of people flee. Because Aleppo has been an important stronghold for the rebels, the government advance is potentially one of the most significant shifts in the conflict.

A look at the key players and their next possible...