Region
Soviet Union
Soviet Union --
82
United States
46
United States --
30
Europe, Eastern
7
Europe, Eastern --
7
Developing countries
6
Europe --
5
Middle East
5
Middle East --
5
China
4
Europe
4
Developing countries --
3
India
3
India --
3
Syria
3
Syria --
3
China --
2
East Asia
2
Former Soviet republics --
2
Great Britain
2
Great Britain --
2
Israel
2
Israel --
2
Japan
2
Japan --
2
Yugoslavia
2
Yugoslavia --
2
Africa, Northeast
1
Africa, Northeast --
1
Artic regions
1
Asia
1
Asia --
1
Asia, Southeastern
1
Asia, Southeastern --
1
Austria --
1
Baltic States
1
Barents Sea
1
Barents Sea --
1
Canada
1
Czechoslovakia
1
Czechoslovakia --
1
East Asia --
1
Eastern Europe
1
Espionage, America --
1
Ethiopia
1
Ethiopia --
1
Former Soviet republics
1
Germany
1
Iraq
1
more ...