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Nothing particularly concrete. What do you expect can be done?

Kick out any Chinese that take part in these police stations on the side of the authorities.

Yes, that. But first raid the place, with no notice, in overwhelming force, and seize all the papers.

what if they have permanent residence permit or more?

A fair trial and (if there is evidence) a long time in jail.

Then they'll find that it is our laws that matter.

Treat them as spy. What are sedition laws are for?

Countries should enforce their sovereignty and write laws to make external countries unable to influence their citizens