General Discussion
In reply to the discussion: 30 yrs ago today: Ukraine disarmed itself voluntarily in exchange for security assurances from US, Britain and Russia [View all]Emrys
(8,090 posts)The Falklands (if anyone wants to split hairs over them, yes, they are technically a British-administered overseas territory inhabited by Britons) was an existential conflict for the Thatcher government. Its polling was atrocious, then Argentina invaded, and the scramble to fire up the public and scrabble together a task group convulsed the whole country - living here, it felt like a real war, extreme jingoism included, along with the sad fate of too many veterans who never recovered from their experiences even if they didn't die in combat. If the task group hadn't defeated the Argentine occupiers, say if a negotiated end to the conflict (which seems to be all the rage nowadays) had been necessary, it's likely the Thatcher government would have fallen.
Kursk has also been one in the eye for Putin when he least needed it, but not yet an existential threat, granted.
Since you mention Israel, the Yom Kippur War occurred when it's highly likely Israel had already developed undeclared nuclear weapons, and that seemed quite existential at the time. The nuclear weapons didn't seem to play a role in the outcome.
There have been cross-border incursions on both sides between Pakistan and India, but again, yeah, not existential so far.
Russia and China have also had some cross-border incursions either way.
And then I'll come to the USA, the one nuclear-armed state that's actually used them in war.
The Russians are bragging openly on-air that they're literally dismantling the US's political system and installing a friendly regime.