Region
Soviet Union
44
Russia (Federation)
7
Saint Petersburg (Russia)
6
Saint Petersburg
5
URSS
4
Berlin
3
Berlin (Germany)
3
Germany
3
Russia
3
Caucasus, Northern (Russia)
2
Donets Basin (Ukraine and Russia)
2
United States
2
Caucasus, Nothern (Russia)
1
Donets Basin
1
Europe
1
Northern Caucasus
1
Russie
1
Saint-Pétersbourg (Russie)
1
Ukraine
1