Greece is certainly a nation state, being primarily occupied by "Greeks" (referring the the nebulous concept of a national identity). It doesn't matter if some

Greece is certainly a nation state, being primarily occupied by "Greeks" (referring the the nebulous concept of a national identity). It doesn't matter if some French or Turks live there. A country that strictly limited residency by ethnic identity might be called an "ethnostate" and indeed it's hard to find a pure example of one of those.