I see the point. But I disagree with that...
* First we need to make sure we tried every other option. If WW III does start we need to be 100% sure it wasn't started when there was some other option.
* I think he's a very logical actor. People incorrectly say that his operations don't make sense. They make perfect sense. He did test runs in Crimea, Eastern Ukraine and Syria. The west didn't do anything so he assumed nothing bad will happen
The problem is he's stuck now. He wants to withdraw but he can't without looking weak. He climbed too high on the tree and he knows that if he withdraws without a "win" he won't live much longer. The west needs to find a way that he can spin as a "win" moving forward. Otherwise this might snowball.