They won't go home mate, and I honestly can't believe the naivete to think they will.No, it isn't what I am proposing at all. If the deal is rejected and they take the whole country anyway, all it will prove to him is that he can get away with flattening a country, subjecting a populace (probably genocidally) and it will train his army in doing that as well as well. He will think he can do it again, which is what the danger is to the rest of the world.
To draw the Finland parallel again - when Stalin went into the Baltics and Poland in 1939, nothing the Red Army and security services did there dissuaded him from trying that again. When he went into Finland in 1940, he learned plenty that dissuaded him from trying it again and learned to offer peace rather than smash an opponent with brute force. If this peace deal is signed and their forces go home, I am sure Putin will call it a victory, but I am also sure that a lot of troops and civilians will tell the folks at home what it was actually like.
As I've tried to say all along, there are no good outcomes here but there are very, very bad outcomes.
The Winter War didn't end cuz he "learned" - they had massive casualties and objectively stronger points to capture in the war anyway. Because you're quite smart I assume you also know that the aftermath of the peace treaty was that Russia attacked again a year and a bit later, right? Do you see the parallel?
There are only bad outcomes, but the only way is to fight. This is why all (or almost all) of the ex-USSR countries are on the Ukraine side, why we're trying to help.
Because we know. We've seen. We've barely lived through it. It wasn't good.
Why don't you (as in the west, not... like, personally obvs) trust us (ex-USSR) for once?