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I don't think the threat would come from for example Russia. However the US still need nuclear weapons. If country X has nuclear weapons and the US doesn't have any then it's just a matter of time till some crazy fanatic country bombs away. The only thing that'll keep such a nutball state from pressing the buttom is the knowledge that they themselves would be bombed.
There are plenty of countries in the world who'd happily use nuclear weapons in case they thought themselves safe.
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