You are thinking Germany-France. But there making peace was the basis for going union. This is no longer valid when you think Greek Cyprus-Turkish Cyprus/Turkey or Baltics-second-class-Russian-citizens/Russia (to make things worse, in both cases with the patron outside of the EU), or Hungary-Romania, or Central European majority populations-Gypsies.

_{*Lunatic*, n.
One whose delusions are out of fashion.}