The Americans are abandoning their post in the world, so the world is adjusting to get on without them. I think it’s probably a good thing long term that Europe grows to protect itself from Russian aggression without having to rely on the unreliable.
Europe as a whole has also failed to hit NATO defense spending targets, for at least a decade. Look at this article from 2016. https://www.defenseone.com/ideas/2016/07/nato-spending-two-c...
At some point a partnership isn't a partnership if people don't participate.