Foreign investment is a main element driving chinas economy, i don't see why they would harm economic growth by invading a NATO country and primary export partner, especially as bilateral relationships have improved considerably. China, as the US, is actively pursuing new energy strategies, a dispute between the US and China over natural oil resources seems rather unlikely. Aside from the economic POV, and although Chinas military is in the process of modernizing, it's military expenditures are only a fraction of the $370 billion (FY 2004 est.) the U.S. is pumping into a "high tech" army. The bulk of Chinas military equipment, in all branches, is rather low-tech and obsolete by todays standards, compromising mainly of copys of older russian equipment as already said.