Let's say the US balkanizes, becomes decentralized and finally stateless. What to do with the nukes that were left over? Who controls them if there's no central power? Obviously, there should just be no nukes, but let's say other countries that are still states have them, so would it be prudent to denuclearize?
It's most lilely that Moscow pulled the nukes out before these countries became independent. I doubt that the Ukraine or w/e would have denuclearized if they'd have had any nukes left after gaining independence.