[mschuster91]

Both to be honest, and that's not just for Bulgaria/Romania but all former Yugoslavian and USSR countries, and even Western-allied countries such as Greece and Italy.

The EU failed to predict local government's corruption or outright destructive behavior (e.g. Visegrad blockade in refugee questions), its foundational assumption was that member states were all aligned towards one common goal and not behave actively destructive. Local governments failed to uphold their values and more often than not saw the EU as a cash cow waiting to be exploited.