Syrian regime encircles Aleppo under Russian air power

Syrian government forces cut rebel supply lines to Aleppo under cover of Russian air power on Wednesday, in what could be a pivotal moment in the five-year war.

After three days of intense fighting and aerial bombardment, regime forces, believed to include Iran-backed Shia militias, broke through to the formerly besieged regime enclaves of Nobul and Zahra.

In so doing, they cut rebel-held eastern Aleppo off from outside help.