The #EU isn't perfect, but let's NOT throw the baby out with the bath water. There are competing views in the institution, with every country advocating for what it sees best for itself.
In terms of how situations change minds, I draw your attention to Sweden & Finland joining NATO. Why now after all these years? Their situations changed with #Russia's invasion of #Ukraine, hence so did their security priorities.
Like I said, necessity is the mother of all invention.