Region
Soviet Union --
Soviet Union
7
Russia (Federation) --
5
Developing countries
2
Europe, Eastern --
2
Former Soviet republics --
2
Russia (Federation)
2
Russia --
2
United States --
2
China
1
China --
1
Europe, Eastern
1
Former Soviet republics
1
Great Britain
1
Russia
1
Russia (Ferderation) --
1
Russia(Federation)
1