It's my understanding that if not for the development of ICBMs, the US might have created cruise missiles powered by unshielded nuclear reactors. They got as far as running a prototype engine for five minutes, but the whole project became pointless when it became clear ICBMs would work.
Russia has seemingly been developing this same sort of technology in recent years. Presumably this is in response to anti-ballistic missile technology calling into question the future effectiveness of ICBMs.
https://en.wikipedia.org/wiki/Project_Pluto
Russia has seemingly been developing this same sort of technology in recent years. Presumably this is in response to anti-ballistic missile technology calling into question the future effectiveness of ICBMs.
https://en.wikipedia.org/wiki/9M730_Burevestnik