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Soviet soldiers floating to earth over the crowd during a mass parachute jump that was a feature of the display at Soviet Air Day. Joseph Stalin, who cause the world consternation by his proposed pact with Germany, watched with 1 million people as bombers and fighters of the Soviet Air Force engaged in mimic warfare over the Tushino Aerodrome, Moscow..23 August 1939 (KEYSTONE/United Archives / TopFoto/TopFoto.co.uk)