"An extreme and inaccurate statement. The US is still party to NATO Article 5, meaning the blood of our young people is pledged to be shed to defend, say, Estonia. That has not changed"
What changed is the US President saying things like, he will encourage Putin to invade countries not spending so much on military.
What also changed is the US President threatening members of the EU militarily over greenland for example.
Reliable allies don't really do that.
(you probably do not realize the shock Denmark felt over this, that went deep and the change will not happen over night, but it will happen)
There's also no guarantees that the current president or administration would honor those NATO obligations if Article 5 is called.
The president has repeatedly been vocal about the US leaving NATO as a possibility.
If I were the EU, I certainly wouldn't be counting on the US honoring any of its agreements and I'd be planning with the assumption that they will not join a NATO response.
What changed is the US President saying things like, he will encourage Putin to invade countries not spending so much on military.
What also changed is the US President threatening members of the EU militarily over greenland for example.
Reliable allies don't really do that.
(you probably do not realize the shock Denmark felt over this, that went deep and the change will not happen over night, but it will happen)