I would not look forward to being an American businessman abroad in China right now. I think we're all used to the fiction that we live in a world that's totally governed by fairness and laws. That's been a pretty useful fiction for a long time, and in (some) of the developed world that's basically been how it's worked.
But I really wonder how many shocks this system can take. I would bet money that an important US executive for some company is arrested in the two years while visiting China.
EDIT:
There's another comment here asking how it's possibly legal for the US to do this. Whether you believe it or not, it's useful to know that the philosophy much of our state department believes in is called Realpolitik (https://en.wikipedia.org/wiki/Realpolitik). It doesn't really matter what the law says or what treaties we've signed, the primary thing that matters for the US is what's pragmatic for it at the moment.