Washington Is Worried About a Shifting Rebel Alliance in Aleppo

The city at the heart of Syria’s civil war has seen a dramatic reversal in fortunes in recent days, as rebel fighters in Aleppo made a daring advance against forces loyal to the regime of President Bashar Assad. Opposition fighters reported that they had punched through pro-regime lines on Aug. 6, piercing a weeks-long siege on the eastern half of the city held by the opposition, even as they were able to surround the regime-held western side of the city.