At the end of the day, Ukraine should've just kept the nukes.

Would have been pretty useless. Keys to the nukes were in Moscow. Ukies tried to crack them, couldn't do it, returned it to get money, then squandered the money.

https://en.m.wikipedia.org/wiki/Ukraine_and_weapons_of_mass_destruction

It's right there in the last paragraph of the overview, lol.