Honestly, the nuclear non-proliferation movement is dead and gone, and has been since February 2022 (really, since February 2014):
If Ukraine had managed to keep their hands on even a handful of nukes instead of handing them off to Russia as a result of the Budapest Memorandum, Russia would not be invading Ukraine right now, because the consequence would be “Russian cities start turning into glass”.
If the other signatories of the Budapest memorandum (the US and UK - I’m intentionally leaving Russia out for obvious reasons) had done more than effectively nothing in 2014, and had provided much more robust support - up to and including direct intervention to support Ukraine - in 2022, Russia would not be fucking around like this.
The Ukraine War has proven that nuclear weapons are the absolute final word in maintaining sovereignty, territorial integrity, and unilateral geopolitical power.
If Ukraine had any, Russia would not be able to prosecute the war without wildly disproportionate negative (nuclear) consequences from Ukraine.
If Russia didn’t have any, they would not be able to prosecute the war without proportionate negative (conventional; regime-change) internationally-driven consequences.
TL;DR: nuclear non-proliferation doesn’t work if you don’t strictly and vigorously enforce defense arrangements that are directly related to said non-proliferation.