They should be legally and physically separated and these actions should be then potentially illegal for Europeans so I do not think I'm at least infactual.

But assuming the owner is US company abiding US laws it's safe to assume that data would be transferred to US one way or the another.

The US intelligence machinery spied on Angela Merkel's phone. Do you suppose secretly demanding cooperation for Lawful intercept capabilities in Amazon GmbH is somehow beyond or beneath them?

Also consider that all communication between the European subsidiaries to the HQ is fair game under FISA.