this didn't happen that long ago.

gmail was broken into by someone representing the chinese government. google fully admitted to this. this admittance did not seem to hurt their rep. they would probably admit to it if it had happened again.

google soon thereafter asked the nsa to help them out with security.

http://www.washingtonpost.com/wp-dyn/content/article/2010/02...

http://www.nytimes.com/2010/02/05/science/05google.html

I am not saying that it's impossible for China to get in, but I'm sure it's a whole lot harder