https://www.theguardian.com/world/2022/aug/31/china-uyghur-muslims-xinjiang-michelle-bachelet-un

Identify the international law in the story and provide relevant background on it, including:

(1) What's the source of international law?

(2) What is the relevant history of the law?

(3) What does the law provide/require?

(4) What actors are subject to it?

(5) Anything else a reader would need to know to understand how the law works?