Its a stupid suggestion to put it mildly, pardon my french. There is no deal to be signed. Unless you mean complete Ukrainian surrender, being dragged into being another Russian slave like Chechnya or Belarus. Putin doesn't accept anything less. Russia is now yet another horrible dictatorship, no reason to believe Ukraine would fare any better, in fact most probably much, much worse due to resistance to this invasion.
By now we all see that Russian words are less than farts in the wind, meaningless blabber with no face value.
This all was the reason why they resisted in the first place, they have good memories of brutal Russian oppression from all of 20th century. Why should they give up everything now? Doesn't make any sense.