That basically almost already happened with the Microsoft case a while back. The US government asked Microsoft US to give it some data that was held by a subsid

That basically almost already happened with the Microsoft case a while back. The US government asked Microsoft US to give it some data that was held by a subsidiary (call it Microsoft EU) in Ireland. It went quite high up in the US courts, because it was illegal for Microsoft US to not hand over the data, but also illegal for Microsoft EU to hand over the data. But basically because the company was split along jurisdiction lines, there was the possibility for Microsoft US to tell Microsoft EU to hand it the data, Microsoft EU to say no, and Microsoft US to say to the US government "Well, we tried."