Earlier quoted context omitted.
> Trump has done more for NATO rearmament than any US president in history Putin did that. To the degree Trump's statements have had an effect, it's in deharmonizing trans-Atlantic military coöperation. (EDIT: Trump and Putin had similar effects. See [1].) [1] https://news.ycombinator.com/item?id=39540275
>Putin did that. No. As I said, not even an actual land war in Europe has been as effective as Trump's mean words in getting Western Europe to actually get off their butts regarding defense.
The truth is that for many European countries military defence is was a bit of an abstract concept, with no real enemy nearby and no really interventionist foreign policies. Letting NATO rot was not a big problem in that context. What changed everything was when an enemy willing to use its military in a war in Europe materialised.