When President Donald Trump heard that Russia’s experimental nuclear-powered cruise missile had exploded, killing seven scientists and causing a major radiological incident less than 300 miles from the Finnish border, he fired off a boastful tweet. “We have similar, though more advanced, technology,” he said.
This is…not accurate. In the late 1950s and early 1960s, the United States pursued a less advanced version of a similar technology but abandoned the effort before ever launching an actual test vehicle. Nuclear-powered cruise missiles, the Pentagon concluded, are a bad idea.