To add Godzilla's point,

China has successfully demonstrated their satellite shooting missile that can destroy any satellite in the space, which is enough to zeopardize american edge of technological lead when they enter into serious confrontation. No other country has that technology tested successfully. USA and Russia are believed to have that knowledge in theory but yet to verify if their knowledge works fine. In Afganistan, Kosovo, and Iraq war, they have uncovered numourous examples of failures of their laser guided missiles. Therefore having advanced technology does not guarantee a successful mission.

Also, China is the only country that is successful to monitor activities in internet and control and pollute radio-waves in their interest, which puts them in better shape when they require to defend them.

Besides that, nobody knows the strength of chinese intellegence in foreign land. In the power struggle, the intellegence plays major role than the technology. Successful campaign of KGB was believed to be in behind leading-military-strength of Soviets. Revealed strength of chinese military and technological advance such as space-travel, long-range heavy carrier missiles tests and guided missile technology must be backed by their intellegence and innovative brains. One can easily guess the information from USA leaks to China through chinese immigrants in the USA but the opposite is not that easy due to reserved nature of chinese government and people. You will understand this better if you get chance to work closely with chinese people.