-At that point, of course, they'd meet resistance from Russian forces which suddenly _have_ a good reason to fight, likely also being supported by a population

-At that point, of course, they'd meet resistance from Russian forces which suddenly _have_ a good reason to fight, likely also being supported by a population which will not be thrilled at a bunch of mercenaries having a go at their homeland. Kicking a poorly motivated invasion force out of the Ukraine is one thing. Wreaking havoc in Russia? Quite another. Now, Belarus, on the other hand, I could see toppling over in such a way (unless propped up by Russia)