Nice army you got there, Vlad. It'd be too bad if they got bottled up in that chicken neck peninsula, wouldn't it? Armies have had historically hard times trying to fight in The Crimea. Look at the map!
Oh yeah? Who's going to bottle them up?
Historically, Russia has never lost a war of invasion. But it has never won a war of aggression. [This, from a Russian friend who emigrated here.]