Actually that's why the US shouldn't have unilaterally left the ABM treaty in 2002, but by now the Russians are a fair bit along in developing nuclear powered c

Actually that's why the US shouldn't have unilaterally left the ABM treaty in 2002, but by now the Russians are a fair bit along in developing nuclear powered cruise missiles. Who knows, they might be working on (fractional) orbiting nuclear weapons too, they've deployed such systems before.