Competition and markets authorities are empowered to block acquisitions and it’s often high profile when it’s done due to an unfriendly power like china trying to do it. The USA is now a more aggressive power than china so acquisitions by US companies ought to be blocked by default.

This may mean less money flows from the US into the European acquired companies, but tough shit, this is too important.

We need to realise that the status quo is not what we had two years ago, because Trump changed it. He’s making the whole world poorer, and we can choose whether that poverty affects us monetarily (because we need to put money into replacing US tech) or more fundamentally - e.g. if he uses dependence on US tech to exert political control over European nations.