The fall of rebel-held eastern Aleppo would not mean the end of the fight against President Bashar al-Assad, the Syrian opposition’s senior negotiator has told the BBC.
George Sabra added, however, that it would make any hope of a peace deal more difficult.
Syrian forces backed by heavy air strikes have seized more than a third of rebel-held territory in the city.
Rebel factions say they have pulled back to a more defensible front line.





























