The capture of all of Aleppo is President Bashar al-Assad's biggest success since the war in Syria began almost six years ago.
It is a crushing defeat for opposition fighters who have been forced to retreat.
Does Assad have enough manpower and weapons to protect the territory his forces have retaken while, at the same time, trying to win back more areas?
Presenter: Hazem Sika
Louay Safi - chairman of the Syrian American Council and a former spokesman for the Syrian National Coalition
Pavel Felgenhauer - Russian military and defence specialist
Michael Horowitz - director of intelligence at the geopolitical consultancy, Prime Source
Source: Al Jazeera News