The reason why the EU never "got serious" about building military after WW2 was mainly due to US interference.
The EU actually spends quite a lot in defense, but does so very inadequately. Each country has their own army, so there's a lot of overlap in spending. I actually think that now that the US is essentially an enemy nation, EU will be forced to integrate more, as that's the only way it can pose a meaningful response. That can only be a good thing.
Also, I think you are underestimating how much the US is alienating EU in this, and how badly it is damaging relations. Trust is something you earn in droplets but lose in buckets.
The EU actually spends quite a lot in defense, but does so very inadequately. Each country has their own army, so there's a lot of overlap in spending. I actually think that now that the US is essentially an enemy nation, EU will be forced to integrate more, as that's the only way it can pose a meaningful response. That can only be a good thing.
Also, I think you are underestimating how much the US is alienating EU in this, and how badly it is damaging relations. Trust is something you earn in droplets but lose in buckets.