They certainly aren't an ally anymore.
If their economy had been stronger, and were it not for the degree of leverage they EU still has (the trade bazooka threat), we could easily have seen boots on the ground in Greenland - and their signaling to Argentina over the Falklands has been quite clear. The Putin deal is just a continuation of what they've been doing for the past couple of years.
It has been clear as day since Trump's first term that Europe needs to take care of its own security. The political will wasn't there, given poor economic conditions, and the hope that normal service would be resumed in 2020. That, obviously, turned out to be a mistake.
It's worth remembering, too, that there are others in his administration (including Vance) who are more hostile to Europe than Trump is. It isn't just Trump that is (for whatever reason) Putin-sympathetic, a lot of the US right view Europe with contempt.
That there is a degree of codependency is our saving grace, and hopefully buys enough time for Europe to stand better on its own two feet.
This will only hurt the US in the long term, too. Much if its wealth has been generated by being seen as the stable, mostly fair, centre of the world economy. It's allies are probably what kept the US as the world's dominant superpower. It has very arguably lost that status already and Trump has certainly accelerated it.
Carney has the right idea re. a middle powers alliance.