Region
Russia (Federation) --
Russia (Federation)
6
Soviet Union --
5
Europe, Eastern --
2
Arctic regions
1
Arctic regions --
1
China
1
China --
1
Former Soviet Republics
1
Former Soviet republics
1
Former Soviet republics --
1
Middle East
1
Middle East --
1
Russia(Federation) --
1
Soviet Union
1
United States
1
United States --
1