The GRU’s “Viking” Spy in NATO

Espionage History Archive

Journalist and retired Soviet military intelligence (GRU) Colonel Nikolai Poroskov provides the inside story of Swedish Air Force Colonel Stig Wennerström, who ferreted out NATO secrets for the GRU for nearly 15 years from 1948 to 1962. Poroskov relies on the first-hand testimony of Wennerström’s case officer and friend, GRU General Vitaly Nikolsky.


On June 13th, 1952, a Soviet Mig-15 interceptor shot down a Swedish Douglas DC-3 on a reconnaissance mission over the neutral waters of the Baltic Sea. There were eight crew members on board. At that time the Swedes announced that the plane was carrying out a training flight.

A half-century later, in 2003, 55 kilometers east of Gotland the Swedes uncovered the body of the airplane and raised it from a depth of 126 meters. The tail end of the vehicle was torn to pieces by machine gun fire. The bodies of four men were found; the fate of the other…

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