Trump in his first term warned Europe about sucking on the teet of Russian natgas, and those "traditional allies" laughed in his face. He told Europe to meet its NATO treaty obligations and increase military spending, and they dragged their feet.
Now Europe's industry is struggling under substantially-increased energy input costs, and has been caught flat-footed with its armories empty while trying to subsidize the largest land conflict on the continent since WW2. An economic and quasi-military bloc with 500+ million people is begging 350 million people on another continent to protect them from a mere 140 million drunk & corrupt Russians.
....and you don't understand why Trump, who has a fragile ego and is well-known for holding grudges, is antagonistic to the feckless idiot empty-suit bureaucrats who manage Europe? He's a thin-skinned bully and now he's gonna walk all over Europe to do whatever is most advantageous (in his perception) for the US....but it's only possible because European leadership is just as weak as he thinks it is.
Plus he's trying to dump The Ukraine Problem in their lap because the US doesn't really have the capacity to square off against China and manage...well, possibly ANY other additional conflict. If our actions to counter China don't make any sense or seem incongruent, that's because most of the administration is simply too incompetent to get the results needed, even if they understand the nature and scope of the problem.