The Chinese cannot be trusted, case and point our ongoing "negotiations" with North Korea over their nuclear arms. If China told Kim Jong Il today to get rid of his weapons he would have to, and so far they obviously have not. If I was President I would tell the Chinese if North Korea attacks the US or one of our allies with a nuclear weapon, or provides a nuclear weapon to another country or group that does, the US will hold North Korea and China equally responsible and we will retaliate to the fullest degree.
The Chinese aren't afraid of America, they never were afraid of retaliation. They are capable of hitting American cities too. Kind of reminiscent of MAD. If this were not true, how could they send in troops to fight American soldiers from the Korean War to the Vietnam War?