If the west wants to prevent nuclear proliferation they have to defend a county that gave up nukes willingly for the promise of defense. Shortsightedness of the western powers will lead to more countries learning from Ukraine’s mistake and hurt us worse than whining of a despot could ever do. It’s not like that big alliance doesn’t have nukes either.
I feel like the West is just doing the bare minimum to support Ukraine. Enough to be able to say "look we did something" but not too much, because maybe some voters won't understand the benefits of spending their taxes on Ukraine.