"The other areas listed are largely dominated by moderate rebel factions or Islamist groups, such as Ahrar al-Sham and the al Qaeda-affiliated Nusra Front." [1]
Right. They aren't bad dudes like ISIS, they are just, ah, al-Qaeda's Syrian arm. They are totally on the level.
> This is tiresome, just because US govt allies with Muslims that Russia calls terrorists doesn't make them so.
That's true. Just because Russia says they are terrorists doesn't make them terrorists. And, perhaps, using car bombs, suicide attacks, assassinations, and forced conscription of child soldiers doesn't make them terrorists either.
Strangely enough, all of this seems to be sufficient for the the United States to also designate them to be an islamic terrorist organization. [2] (And then issue diplomatic protests when Russia bombs them.)
[1] https://www.wsj.com/articles/putin-seeks-parliaments-approva...
[2] https://en.wikipedia.org/wiki/Al-Nusra_Front