ISIS was quite possibly created, at least in part, by the Russians. The KGB/FSB are notorious for doing such cleverly deceptive things as this. They have a long history of it.
One of the most powerful tools the Kremlin has in its secret arsenal of Special War is provocation, what they call provokatsiya.
While Moscow cannot claim to have invented this technique, which has existed as long as there have been secret services, there’s no doubt that Russians have perfected the art and taken it to a whole new level of sophistication and deviousness. At times, it can become a strategy all on its own (not always, mind you, with edifying results).
Provokatsiya simply means taking control of your enemies in secret and encouraging them to do things that discredit them and help you. You plant your own agents provocateurs and flip legitimate activists, turning them to your side.
When you’re dealing with extremists to start with, getting them to do crazy, self-defeating things isn’t often difficult. In some cases, you simply create extremists and terrorists where they don’t exist. This is causing problems in order to solve them, and since the Tsarist period, Russian intelligence has been known to do just that.
While this isn’t a particularly nice technique, it works surprisingly well, particularly if you don’t care about bloody and messy consequences. ..."
http://20committee.com/2014/03/29/understanding-provocation/
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.