Aren't there laws that deny foreign nationals from participating in protests?
I've noticed the Ukrainian far right participating in HK riots, US gutter filth Ted Cruz visiting HK like it's his "retreat leisure island" and of course US officials having closed room discussions with HK riot leaders.
There is such a law that prevent foreigners in participating, BUT........ it is in the western countries. In Hong Kong and China, where cries of "lack of freedoms" in a Mel Gibson braveheart voice.
It's ironic isn't it, the very freedom the west accused China of, they don't provide.