Saying Europe is a US vassal state is a bit much lol. Europe is one of the biggest economic powers in the world together with the US and China. They all export and import a lot of wares between each other and thus depend on each other. The tariff deal the EU got with the US wasn’t that great and the leader of the European commission, Ursula von der Leyen, got some backlash because of that but I guess her tactic was to just appease Trump so they will have more time to transition away from the US in some areas. On the other hand that deal reduced some very annoying tariffs on steel and car parts, so it was partially successful.