Columbia subject headings:
Harvard subject headings:
Europe, Central--Relations--Europe, Eastern.
Europe, Eastern--Relations--Europe, Central.
Europe--Relations--Russia.
National characteristics, European.
Russia--Relations--Europe.
Princeton subject headings:
Europe, Eastern--Boundaries.
Europe--Boundaries.
Europe--Relations--Europe, Central.
Europe--Relations--Europe, Eastern.
Group identity--Europe.
Group identity--European Union countries.
National characteristics, European.