Region
Former Soviet republics --
4
Russia (Federation) --
4
Europe --
2
India
2
India --
2
South Africa --
2
United States --
2
Asia, Central --
1
Asia, Southeastern --
1
Azerbaijan --
1
Balkan Peninsula
1
Balkan Peninsula --
1
Canada
1
Europe
1
Former Soviet Republics
1
Former Soviet republics
1
Great Britain --
1
Kazakhstan --
1
North Sea
1
Russia (Federation)
1
Russia(Federation) --
1
Sri Lanka
1
Sri Lanka --
1
Transcaucasia --
1
United States
1
Vietnam --
1
Yemen --
1
Yemen(People's Democratic Republic) --
1