This is an existential issue to the Americans. They have made a firm decision that fat boy is not going to be allowed to develop nuclear armed ICBMs that can reach and incinerate cities in North America.  If Trump were to disappear tomorrow and be replaced by Saint Hillary this decision would still stand.
The Chinese can help or hinder but whatever occurs the end result will be the same.
Hopefully all involved can work together constructively so this mess can be resolved peacefully.