[Avshalom]

From a US perspective: The NSA doesn't lean on non-US companies because it is fully authorized to just hack them directly. Your data kept in foreign countries don't even have the nominal legal protection that US data does.

Unless you've got unbreakable security the NSA is well funded enough that it's irrelevant where you do business.

[morkbot]

Except that in the case of non-US companies NSA has to do the actual hacking. In case of US ones they simply need to "ask" a company to, say, handle them their master keys - much easier.