It's very hard, actually, to fight it without crossing the line of freedom of speech. If you think the earth is flat, it's not my problem as a legislator, but if a foreign government launches campaigns so that millions of my fellow citizens believe the earth is flat, then it becomes a problem for me. What we have to act upon is not the fact that people will share weird opinions, but to cut this from foreign actors using it and putting money in it.
What we have done is, first, impose regulations on platforms, and that's the key. I'm often critical about the European Union, but one piece of legislation that I'm very proud of is the Digital Services Act on platforms.