Space Warfare?

So you hear about spy satelittes being up in space. US spy satts above Chinese airspace and vice versa. Since no one had jurisdiction over space, what stops China have blowing up US spy sats and vice versa?

>>4
The fact that some of today's scientists are playing with those ideas shows we're still stupid self-centered shit. Oooh, if a human doesn't hear it, it doesn't make any sound. Sounds like "The Earth is the centre of the universe!!!11one".