China is better off not antagonizing the US and forging ever closer economic ties. China's future as a global power lies in accessing the US and European and Asian markets. A military alliance with Russia will just complicate things on the economic front. The Chinese ought to just focus on economics and let the other countries maintain global stability. China is big enough that no one is going to bother them.
China and the US are an odd couple like the USSR and Iran. Don't even bother trying to understand.