Region
Russia (Federation)
Russia (Federation) --
12
Europe
4
Europe --
4
Soviet Union --
3
United States
3
United States --
3
Former Soviet republics --
2
Soviet Union
2
Asia, Southeastern
1
Asia, Southeastern --
1
China
1
China --
1
Developing countries
1
Developing countries --
1
Former Soviet Republics
1
Former Soviet republics
1
Middle East
1
Middle East --
1
Russia --
1
Russia(Federation) --
1