Disarmament can happen in a context where a nuclear country doesn't have more than, say 3 nukes. While 3 nukes could theorically kill millions, imagining both sides had three nukes and both of them used against each other, we would have "limited" casualties, and largely restricted effects to both sides of the war. Now comparing this 6 nukes scenario with UK, USA, Russia, etc. Engaged in a World War where each country has dozens/hundreds of nukes, one could notice the difference of nuclear disarmament.
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