This war might end in the traditional European way, like before WW2, with an armistice, a Russian withdrawal and peace negotiations. However, there is the problem of Vlad being a reliable partner for peace, but if he left all of Ukraine there would be little cause for war and Ukraine couldn't attack Russia unless they kept firing missiles into Ukraine, but no fighting on their turf. All Vlad has to do is leave Ukraine including Crimea and not attack them with drones and cruise missiles to have peace. He can even retain power if he can, while he does it, but he will have to step on a few hardliners necks to do it.
Lots of peace or truce talks in the air, but nobody is forcing Ukraine to the table while Russia is still on its soil. This is a way out for the cornered rat, he won't like it and there will be blood running out of his asshole, but he either leaves or gets the bum's rush with a lot more corpses. His entire army is destroyed, and nearing collapse, mutiny or coup and the economy is crashing on the rocks as his allies flee. It's not like Vlad has a choice, his own people will kill him and talk peace if he does not, or the army will simply leave Ukrainian territory and make the best terms they can with the Ukrainians while rebelling against Moscow.