“This would slow down the decision about whether to launch them,” says Perry. It’s commonly assumed that a nuclear response must happen quickly, before the ability to strike back is lost. But even if many cities and all land-based missiles in the US were wiped out by nuclear weapons, the surviving government could still authorise military submarines to launch. “The only kind of retaliation that’s warranted is one where you know they are attacking. We should never respond to an alarm that could be false,” says Collina. And the only truly reliable way to make sure a threat is real is to wait for it to land.
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