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Nuclear weapons are not just deterrents against nuclear attacks. They are a deterrent against attacks in general. If Ukraine still had nuclear weapons, Russia would not have invaded it over the last 18 months.
But it hasn't worked that way in practice:
For the smaller example, Gaza routinely shells Israel.
For a much bigger one, 2 nuclear-armed states have fought a full-on war, India and Pakistan at Kargil in 1999. Both continue to have routine border skirmishes. So do India and China. So did the USSR and Mao's China.
The only effective nuclear deterrent right now I would guess is North Korea.