Region
Soviet Union
Soviet Union --
169
United States --
67
United States
66
China
26
China --
23
Asia
15
Asia --
13
Developing countries
10
Europe --
9
Europe, Eastern
9
Europe, Eastern --
9
Middle East
8
Middle East --
8
Europe
7
India
7
India --
7
Asia, Southeastern
6
Asia, Southeastern --
6
Japan --
6
East Asia --
5
Japan
5
Pacific Area
5
Afghanistan --
4
Developing countries --
4
East Asia
4
Pacific Area --
4
Russia (Federation)
4
Russia (Federation) --
4
Great Britain
3
Great Britain --
3
Israel
3
Israel --
3
Pakistan
3
Pakistan --
3
Russia
3
Soviet Union - --
3
Syria
3
Syria --
3
Yugoslavia
3
Yugoslavia --
3
Afghanistan
2
Africa
2
Africa --
2
Eastern Europe
2
Germany
2
Germany --
2
Russia --
2
Singapore
2
Singapore --
2
more ...