What’s going on in this war? The stalemate haven’t been broken yet?
Assad is an Alewite, which is a Shiite sect. Trust the upper ranks, pilots and key personnel in the military were Alewite or Shiite.
Syria is almost 70% Sunni Muslim. This percentage was probably reflected in Assad’s infantry and those Sunni’s long ago deserted.
You can hold territory without infantry. Assad can’t make gains and hold them.
This could go on for decades.