I don't think it's happened in China, but I did see that some foreign banks are refusing to open accounts for US citizens. Similar problems are happening with US citizens involved in setting up JVs in some countries. The US is using every trick in the book (and making up new tricks) to force foreign banks to provide reports on all accounts owned by US citizens.
BTW - For any of you who are US citizens with more than $10,000 total in all non-US accounts at any point during the calendar year, I hope you've been filing an FBAR. If not, the fines are incredibly high.
The US now has an exit tax for wealthy individuals. I wonder exactly where the concept of this departure tax came from? At the risk of violating Godwin's Law, I know of one country that used it extensively.