>China
China has thousands of spies here in colleges, industry, tech, medicine etc. Anyone who works with a Chinese on a green card had better get chapter and verse on them, where they live, who they associate with, what do they drive, where do they eat, where do they shop etc.
They're behind enemy lines and should be dealt with accordingly if China makes a single aggressive step towards us or Taiwan. Be prepared to do what is necessary to neutralize them and prevent them from communicating with the home country.