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Funny thing is that a US project of nuclear-powered cruise missile Project Pluto has been abandoned in 1964 among other things in order to "not to provoke" the Russians into developing something similar... "against which there was no known defence".

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Project Pluto was abandoned for many other reasons too. Cruize missiles didn't have to be powered by a nuclear ramjet.

Although at the time there was no defence against them, there is now. Developing it will be expensive, and the system will have a rather low hit rate, but modern electronically scanned radars, UAVs and AI-based target detection can easily be tuned to take down cruize missiles regardless of the payload.

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