To teach English in China the law requires that you are a citizen of China or a citizen of one of 6 'native English speaking countries.'

Yes but there's countless thousands of Eastern Europeans teaching English in universities in China and then moonlighting in training centres on the backs of their legal residence permits which enable them to have contracts with universities. I'm not just saying this, I lived with these pretenders (they claim to be American) and met them on a day to day basis ending last May.

I'm not doubting what you say, just saying that there's another reality living alongside. What is a bit scary is the Chinese employers seem to prefer the Made-in-Ukraine-never-been-to USA-yanks to the real thing and also to the English and Aussies, etceteras.