China is playing the old game, negotiation and negotiation and negotiation, never intend to make any change. They can even make promise to make changes after long long long negotiations and never do anything. And then when someone finally decide to do something about it, they will ask for a new round of negotiation and negotiation and negotiation.
Xi will stay in power may be in next 20 years, and he knows US will have general election in every 4 years. Trump gets the idea: https://twitter.com/realDonaldTrump/status/11261065400150712...