Its definitely not stable, because the nuclear-armed countries' only arguments against nuclear proliferation are "trust us, you don't want this" and (said quiet

Its definitely not stable, because the nuclear-armed countries' only arguments against nuclear proliferation are "trust us, you don't want this" and (said quietly) "if everybody has these, we'd lose a lot of power". So non-profileration efforts are a game of cat-and-mouse. We needed to have an ironclad "we are demonstrating that nobody needs nuclear weapons by doing x,y and z", and instead, Russia and NATO both said exactly that, then kept provoking each other to see who would flinch first over Ukraine. And I agree, nuclear power is a ridiculous casualty of that scramble for power.