What about Huntington´s propossal for "EU limits"?
Samuel Huntington's hypothesis that Western values are not of a universal nature. #1 They appeared in a given, West-European, Roman Catholic and Protestant zone, within which a specific cultural tradition has developed. The modernization of the rest of the world, namely of zones in which other types of civilization have taken place, be they Orthodox, Islamic or Japanese, may be possible, but Westernization is not. Elements such as the political culture of the West, individualism, or a work ethic that
is specifically Catholic or Protestant, cannot be truly achieved within the limits of another civilization.
Huntington charts the limits of Western civilization in this sense.
His border in Eastern Europe runs to the east of Finland and the Baltic states and it dissects White Russia, the Ukraine and Romania. Transylvania and the Banat are as much within Western civilization as the Voivodina and Croatia, but extra-Carpathian Romania remains outside, together with the Balkans and the rest of the Orthodox world. Thus, in Huntington's opinion, the ancient confines of the Holy Roman Empire and of the Habsburg domains, taken together with the limits of Roman Catholic and Protestant expansion in Eastern Europe, stabilize a limit for the eastern extension of the EU, furnishing a relevant criterion for the admission of new members