Instead of taking care of Ukraine themselves, and providing security guarantees to Ukraine themselves, they expect the US to do it. Instead of supplying Ukraine itself, they need the US to do it. And all of this against an opponent, Russia, that is on paper almost entirely insignificant.
As things stand today, European countries cannot survive independently with US support, making them effectively vassals. And what is worse is, most of the political elite in Europe hate the Americans that they have made themselves completely dependent on.
I don't really like this status quo, as a European I think this is pathetic and embarrassing that we are entirely dependent on US without any need for us being dependent on them. But I don't get the elites that complain about the status quo on one hand, and on the other hand refuse to do anything to change it.