How does the EU force an American company to break up? (Not a rhetorical question) Perhaps they might pull a China and require them to open a 51% EU-owned subs

How does the EU force an American company to break up? (Not a rhetorical question) Perhaps they might pull a China and require them to open a 51% EU-owned subsidiary to do business here, which would then be subject to all sort of restrictions including company size. As a EU citizen, I would absolutely love it. But I suspect that the EU is bound by many more and much more comprehensive free-trade treaties than China is, and such a draconian approach would require many of them to be renegotiated or exited outright.