My point is the only way to “defeat” them is to literally have boots in Moscow, if you try to do that then they they have no reason not to launch their nukes, they already lost. That’s the point of MAD, any attempt to fully defeat a nuclear armed nation means everyone loses, which is why Russia will never attack a nuclear armed nation.

If you only push them back to whatever border you want, then they will still be just the other side of that border shooting at you.