The point of having nuclear weapons is to deter a war of any kind. They have succeeded in doing so for the past 37 years. To be an effective deterrent a potential aggressor must believe that under certain circumstances such weapons will be used.

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Quote text and notes from Wikiquote: Margaret Thatcher (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.