It's not quite that simple, even if they had spent more, the US made itself the centrepoint of post-WWII institutions because of the Cold War. As I heard put qu

It's not quite that simple, even if they had spent more, the US made itself the centrepoint of post-WWII institutions because of the Cold War. As I heard put quite succinctly, on one European podcast this week, even if you have 20 European nations spending more, their current military strategy has always been based around integrating into a combined NATO led force, dominated by US command and control structures. Those 20 European nations therefore would need a total strategic rethink of everything. Purchasing decisions would be totally different - like the British storm shadow missiles gifted to Ukraine that rely on GPS - apparently now will not work.