Being a Brit that has lived in the UK, and was in the Royal Air Force reserve, has lived in Canada, and was a similar reservist there, and in the US as a member of the Air National guard (104th Fighter Wing, Barnes ANG base, Westfield MA, "retired" in 1990 due to degraded vision

) I've kept a close eye on the various armed forces of the three countries over the years.
What makes you think the US is weak? Certainly, under the auspices of various progressive administrations since 2009 (I'm looking at you Obama and Biden) that was objectively true, but there seems to be sufficient evidence to suggest that a change is occurring.
I despair at what I see has happened in the UK and Canada, and the totally ridiculous pearl clutching that is occurring.
What country is stronger? The US force posture in Europe has barely changed recently, having been reduced c. 1990, and in fact has actually grown in strength since Putin's invasion of the Ukraine, and US administrations have been asking the other members for many years to not allow their militaries to waste away under the incorrect assumption that the end of history and the triumph of the West is upon us, and to keep up their end of the bargain, and a bargain it was. The US never signed up to be the sole protector of Europe while the European nanny states did less and less and grew more and more anti-freedom as the EU gradually subsumed the continent
If the Europeans feel they are being treated as vassals, maybe they shouldn't behave as if they are vassals. Why does the US have to spend 3.5-6.5% of their GDP on the military while the Europeans get to spend (mostly) sub 2% much of which is on personnel and remnant infrastructure with little modern hardware to back it up?
They have been asked, politely, many times, by numerous US administrations, and they just give the US the middle finger. About time that the US was more assertive.
Tough love is sometimes necessary. Why is it not justified? Aren't decades of nice asking, but being ignored, sufficient justification?
Look in a mirror. You sound like teenagers who have long ignored their parents' advice and are now seeing the consequences.
About time you grew up.
As for buying non-US weapons. Great. At one point you actually had an arms industry, but it has been largely allowed to wither on the vine.
Maybe if the French and Germans could stop their pissing contest over who gets to lead you might actually be able to do something useful.
The comments of the Trump administration are exactly right. It's about time that you realized it, and actually it's probably too late for a number of your countries who are soon to understand what being a vassal state actually means and under a very different and less benign "master" than the US.