Region
Europe, Eastern
Soviet Union
17
Europe
10
United States
8
Europe, Central
7
Russia (Federation)
6
Former Soviet republics
5
Germany
5
Communist countries
3
Czechoslovakia
3
Russia
3
Berlin (Germany)
2
Eastern Europe
2
European Union countries
2
Germany (East)
2
Germany (West)
2
Balkan Peninsula
1
China
1
Developing countries
1
Hungary
1
Poland
1
Southeast Asia
1
Ukraine
1