We don't need a win as we wouldn't be the aggressors, we just need the result of a war to be less bad for us than it would be for them - and it clearly would.What do NATO win with a war against Russia - we would just go back to a Cold war situation with the doomsday clock ticking. I have seen nothing to imply that Putin would back down, have you seen anything specific to indicate he would?
Putin would back down because he's not a fool or driven by unreasonable causes like religion. He knows the only result of an all out war with NATO is the end of Russia - I suspect he also knows that's not in his best interests.