The rebel groups fighting in Syria’s 13-year-long war are a complex patchwork of fighters, focused on battling against different enemies — including, sometimes, each other — backed at times by foreign powers.

The rebels’ advances could threaten to pull Russia and Iran further into the conflict, while the U.S. distanced itself from the offensive.{ai:summary}<p>Syria's ongoing civil war, now in its 13th year, features a diverse array of rebel groups. These factions often engage in conflicts not only against the Syrian government but also among themselves, with varying levels of support from foreign nations. #foreignaffairs</p>

In Syria, it's the Islamists vs. the dictator: How the sudden attack could affect the Middle East

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