It may seem silly, but control of space is control of the world.
There are science fiction novels and movies about this subject, and the TV show Salvation also touches on it, with a terrorist group controlling the world with orbiting nukes.
The Moon Is A Harsh Mistress by Heinlein, from the 1960s, has lunar colonists making the world accept their demand for independence by dropping rocks on them from the moon. And his novella Requiem also plays on that theme.
Still, militarizing space has long been proscribed by an unwritten law, but I'm sure all nations with the means to do it have thought about it, and even made plans for it.
It's just who is implementing it that brings the idea up for ridicule.
But, I believe the world has just gotten much more dangerous.