I don't know if you're trolling, or serious with this, but I'm glad it's not going to happen. Even if we just made it look like we were giving UKR nukes, that's still a seriously destabilizing move that dramatically increases the probability of actual nuclear weapons being employed. To say nothing of the precedent it sets for proliferation.
I'm not serious, but they have to be thinking back to when they did have nukes and gave them up. What if they indeed had them?
Putin is dead set on taking all of Ukraine. Any peace agreement is going to be just a pause for them.
My worry bead...there are other technology cards, not nuclear explosives, that I wonder if Ukraine isn't contemplating holding in their hand, to be played if it looks like the country is going down. What could they do with a dirty bomb? How dirty could it be and make Moscow a toxic waste dump, ala Chernobyl environs?
I worry about chem-bio, which does not take a million centrifuges to make. Bio in particular. What is their motivation not to do that? A big FU to the rest of the planet that stood by and watched.