US give up the protection to TAIWAN. As an exchange, PRC give up the protection to North Korea

The contradiction of two countries focused on the Taiwan issue and North Korea problem. Why dont US do a deal with CHINA.
PRC worry about TW, and US worry about NK. This will not only solve the worries of the two countries, but also closer to the relationship between the two economies, so that we can create a lot of benefit. why dont we do that?