[tobiasu]

You seem unaware that spying is a military aggression that doesn't have to be tolerated.

[khuey]

Except that no remotely rational state starts a war that involves killing real people over a little espionage.

[meddlepal]

Good luck taking on the U.S. military, which, even if you could defeat via some joint coalition involving the EU, China and Russia - the economic fallout from such a war would probably be globally devastating - much worse than whatever damage the US inflicts by blatantly spying on foreign entities.