IIRC the US didn't arm the Taliban, but they did fund the Madrassas that taught them. They were arming the Northern Warlords and the Mujhadeen. The Taliban came after the Soviets left and mopped up the infighting warlords as the Taliban was the only group with a coherent ideology.
Anyways minor pedantry for against an already stupid point.
Isn't this kind of a dead end anyway? Chechnya under Kadyrov has been quite stable, with a lot of the armed opposition essentially brought into the fold. In addition, they achieved a lot of their resistance aims and were given much greater autonomy already.
The remaining Muslim minorities aren't particularly concentrated or organized, I don't think.
You have already. In pretty much every country and every conflict that borders Russia.
In fact, you've gone so far as to start hiring random, war-broken terrorist day labourers for a pittance to do mass shootings and arson against civilians.
What possible additional groups could you find to fund and arm?
Oh, he's one of these racists who believes every Muslim person, including those just living their lives in Russia, is a secret potential terrorist isn't he? And that they should harness that.