I'm being hyperbolic, but whenever tensions hit the EU members will just go back to their old ways, the idea European states will somehow unify in face of a threat is absolutely laughable, no Belgian soldier will ever take orders from a polish sergeant.

When the question was asked of "How will we pay for covid" The dutch gov was instantly saying they "won't pay for those lazy southerners"

The EU alliance always was about monetary gain, not building an actual coherent political entity.

Probably the endless degradation of worker rights, welfare state, salaries and infrastructure since 2008, coupled with the rise of the far right?

Germany happily joined the bombing of Libya and Yugoslavia, and the invasion of Iraq. Just because now it's brown people dying, it doesn't make it better.