The real thing that's changed here is that the US gets no benefit from defending Ukraine or Europe
European politicians need to wake up NATO was really an exercise in helping the US with its proxy wars their support will not be reciprocated
Not with trump and not with his successor
The US may believe the US gets no benefit from defending Ukraine or Europe, but that belief is false.
Even with greedy short-term thinking: The economic connections between the US and Europe are a big part of US wealth, and failing to protect your market and your investors is bad for business.
Ukraine… Europe supports Ukraine to keep Europe safe. Ukraine is not in NATO, nor is it covered by the EU treaty's mutual defence article.