Yeah you right foreign agitator may do a trouble. But our Muslims know that islamists are their enemy in first place and they are not blind and see how things are going in the islamic states. They don’t want it for themselves.
And last they know that FSB will be all over you if you give them any help. So Russia is cautious but not afraid.
I just remembered, some Middle Eastern friend told me, that the most scary radical Muslims are the Chechens. ISIS had a lot of Chechens and other Russians as members. As a matter of fact, ISIS military leader was Chechen.