I believe his best chance would be to tell his representatives to contact Putin about it, he has the capability to persuade Jinping arrange a deal to send him back. The Chinese are in no mood to talk to lying American politicians directly about anything.
Also, it could be that we wouldn’t want a deal to get him back, our nutty leaders would rather use this guy for the pro war propaganda case against China. If so, he is SOL.
Our leaders don’t have a prowler stance against China, have you been living under a rock since the 1970s?
Our current crop of leaders are in China’s pocket, and for that matter, so is most of the antiwar crowd.