Whole battalions of Russian speakers have been in ISIS, Ivan the Chechen was a main leader. You have that right. And before, Assad had no problem allowing jihadists to have camps and attack the US and other coalition forces in Iraq; so much to the point, that Bush almost ordered an invasion of Syria as well. That's historic record. It goes on and on.
Per keyword "Russia"; there is the story that Russia requested the US to lift surveillance of ISIS after Russia's ally Hezbollah let ISIS fighters escape from Arsal, Lebanon.
Is Russia still arming the Taliban.
How’s that missile deal with Turkey going with Russia, Putinistas were telling us, Putin was going to whoop Erdogan’s derriere.