Recently, the Syrian Army and allied militia, backed by Russian air strikes, liberated the city of Palmyra from the group that calls itself the Islamic State (but refered to by many others as ISIS, ISIL or Daesh).
This liberation illustrates the foolishness of the U.S. strategy of supporting “moderate” rebels to defeat the Islamic State as this victory came after a truce between Assad and rebels that weren’t part of al-Qaeda or the Islamic State. In practice, these “moderate” rebels don’t focus on attacking the Islamic State. Mostly, they only fight them when they’re being attacked by them. Instead they focus on attacking Assad’s forces, forcing them to divert forces that otherwise would have been fighting the Islamic State. But now with those other rebels ceasing to fight Assad, Assad can now defeat the Islamic State.