No. China has a defense. A last resort defense. Because 
  they have this defense, the US will not attack China. 
  That's just how it is. Attacking China is suicide because 
  of China's nuclear capabilities.

Technically, China's agreed to never use their nukes in a first-strike scenario. They're supposed to only be used in response to nuclear attack.

That agreement's laughably unenforceable in a full-bird US/China shooting war; but it's there.