Syrian troops tighten Aleppo siege Syrian government forces, backed by Russian air support, have encircled Aleppo, setting the stage for a prolonged siege aimed at eventually forcing the surrender of rebels holed up in the eastern parts of the city TURKEY Aleppo SYRIA Damascus JORDAN IRAQ LEB. 200km 120 miles Government control Military bases Humanitarian corridors established by Russian and Syrian forces for civilians and unarmed rebels to flee Rebel control Kurdish control Jul 9: Syrian forces sever rebel supply route Gazi Ayntap Ave. Jul 27-28: Syrian forces complete encirclement of eastern Aleppo 2km 1.25 miles ALEPPO Castello road Fourth corridor to be set up near Castello road for surrendering rebels International Airport Eastern Aleppo: Around 300,000 people trapped in rebel-held areas CitadelSource: Stratfor