This is a complex question and would best answered in a research consultation. Feel free to contact a reference librarian to set up an appointment time.
In short, though, here are a few suggestions.
"On the Record" inside the United Nations website. Select China
Open search the United Nations website, which will lead you to press releases and select primary documents
News Sources (both can be found from "Databases" under the "Find it" tab from the library website):
LexisNexis
Newsbank
Video and Documentaries:
Films on Demand and the United Nations Multimedia channel. (Films on Demand is a streaming media source we subscribe to and there you will find several videos/documentaries relating to this topic.)
You will also find that the United Nations has a YouTube channel that you can search within.