I've said this a million times. If Europe winds up in some kind of war, the US would be right there and fully committed to fight and die for European countries. But if by chance the US was invaded or our interests attacked, most of Europe would not come to our defense. That is a fact. We know it. They know it.
After 9/11 and Bush went to the UN to justify attacking Afghanistan and Iraq. some European countries, like Great Britain joined us, fully, with troops and weapons. Some did not. Germany, France, and others gave us token support. Forget about whether or not there were or weren't WMDs in Iraq. We were attacked and defending us and potentially them. Many European countries chose to sit it out rather than put their own troops in harms way.
This is why this Ukraine thing is a joke. This war has nothing to do with NATO. I has nothing to do with NATO. It involves a nuclear country with thousands of nuclear weapons. Ukraine would love nothing more than to drag us into this war, while Europe sits back and watches US soldier die on the battlefield.
What concerns me now is that Ukraine will stage some kind of "Sum of All Fears" plot to force the US into a no win confrontation with Russia.