An ICBM with what payload exactly? With a nuke? Getting your hands on a nuke is hard. But, if by some miracle, you managed to launch one into space, then no later than you'd start threatening regulators with it, your nuke would eat a satellite interceptor.

> Just wait until someone surreptitiously puts up a whole network of sleeper nukes into orbit. One weird trick to become world emperor, eh?

Near-impossible to pull off at this point, as it would require absurd world-wide levels of incompetency in tracking nuclear material and space launches. That, or new technology for doing damage (this was a side plot in an excellent hard sci-fi book, A Sword Into Darkness, where a fictional propulsion system created by a private company could also work as a sort-of fusion bomb, without radioactive material).