I agree, and should have taken the time to say what I meant more clearly. The attack will be a non-state actor, who is either based in or comes through a 'stan country. Could come through Chechnya, Georgia, or a Baltic state, too. The Norks might be behind such an attack, but no state/country is going to want to be associated with it - Russia will exact revenge.
Chechnya and Georgia pose no threat because there are no nuclear weapons there.If they are there, they will be under control of the Russian armed forces All nuclear weapons in the ‘stans are in control of the Strategic Rocket Forces.