why is the onus on the invaded country to stop it , particularly when they're winning, and not on the invader ?
You can't pull out the "humanitarian card" when you're losing OR the "nuclear threat card " either . In the final anaysis the latter won't win for Ulraine and the bluff must be called or putin will repeat it .
the problem is putin ... his dreams of russian empire ... as he has admitted ... but russia clearly a second rate power now and apart form the ethics they just aren't capable of it .
and if their nukes are as badly maintained as their army has been .... who knows where they'll go or when they'll explode ?