The surprise offensive on Aleppo by Syrian rebel groups has left the US in the difficult position of not fully supporting either side while also maintaining a force posture of nearly 1,000 troops in Syria as part of the ongoing mission to fight ISIS.

In just a few days, a patchwork of rebel forces has seized control of a broad stretch of land in the west and northwest of Syria. But it’s unclear just how much support Syria’s weakened allies can provide.

The Lebanese Hezbollah movement, which played a crucial role in defending the Syrian government throughout the neighboring country's civil war, has told Newsweek that the redeployment of its fighters would not be necessary in the face of a new large-scale rebel offensive.