But...logic isn't being employed by Putin. He has miscalculated hugely. Yes, he will and is lying about what he wants, the circumstances, and how the world is reacting. He's in a tight spot that is getting tighter by the hour. He was so sure of himself. After all, he has moved his pieces around the Western chess board with purpose for years now with much success--all with a single purpose and no regard for the harm. He must have felt like a mighty man--until this last week.
He cannot recover from this miscalculation.
If he were to do as you suggest he might--what of trust? All that would be proven is that the heavy sanctions worked to hogtie a dictator and menace to the world. He has caused great harm to a free country--its people, economy, infrastructure, buildings and homes. The cost of damage is enormous. Ukraine would need assistance to rebuild and recover.
Why would those sanctions be lifted unless Putin steps down? He is not honorable or trustworthy.
His own circle of oligarchs have been heavily hit as well. They would likely not want Putin to remain in power. Neither would the Russian military or the people of Russia.
There would have to be heavy conditions for Putin to withdraw. He could not be trusted to abide by anything that allowed him to "withdraw(s) into his shell for a while."
Putin would have to agree to retribution that would include absolute retirement and reparations. There would be no way for him to declare victory.
My two cents. 
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