I feel like if the Ukrainian situation destabilises, and it's hard to imagine that Ukraine is currently in a state of equilibrium right now or that it will persist in the long-term, it's not a wild overreach of imagination to assume that there's a possibility of some/all of the armed, trained, blooded fascist (para)militaries might pack up from the frontlines in the east and decide to head westward to stir up trouble.

Am I saying it's a safe bet that it'll happen? Absolutely not.

Am I saying that there's a European Mujahideen phenomenon just waiting to happen if the conditions are right? Definitely.