Are you European? Because I am, and despite what you said being true, I don't think I have much in common with other European countries, not even the ones that border mine... We don't even speak the same language!
“country” and “sovereignty” are indeed terms of political gamesmanship with no clear definition.
The difference between a country, an alliance, a confœderation, and a fœderation is as meaningless as the difference between a language family, and a language.
Yes, it is. Europe is largely a country with free movement of people, goods, services and capital.