The retaking of Aleppo marks the first major development in years in Syria's grinding civil war, which had largely fallen from the world's headlines. It also raises fresh questions about the opposing sides,

Rebels in Syria took control of the Nayrab Military Airport in Aleppo, Al Jazeera reported, citing opposition officials on December 2.Footage from local news outlet Shaam Network shows abandoned military planes and a helicopter at the base.

Syria’s civil war is back in the spotlight after a new rebel coalition launched a surprise attack, sweeping into the country’s second largest city, Aleppo.