Certainly his speech is considered foreign interference in Europe, but since it hasn't been unlawful so far there aren't any actions.

Europe in general is pretty much law-based, so I don't expect arbitrary retaliatory actions.

You mean like how Musk takes retaliatory actions against speech:

https://edition.cnn.com/2025/01/06/business/x-banned-a-journ...

Consumers take retaliatory actions against assholes who use their $44 billion megaphone to interfere in our politics.