Roscat

UBS (UBS) refuses to provide the U.S. government with the details of 52,000 clients as part of a tax evasion probe, arguing that doing so would violate Swiss law. Bank execs say the dispute should be settled diplomatically, not through a legal suit.

Don't provide the list but, if you have broken the law, you are no longer allowed to provide Wealth Management services in the US. Very simple. Similarly was done to Citi in Japan. There is nothing new about the solution.