On October 24, 1991, the KGB released a 124-page 'Blue Folder' covering Soviet UAP observations from 1982 to 1990 across 17 regions, including military depositions, informer notes, and witness sketches. Test pilot Colonel Marina Popovich separately stated Soviet crews had logged 3,000 sightings and that five craft fragments were in state custody.

The file was delivered to cosmonaut General Pavel Popovich 63 days before the Soviet Union dissolved. Marina Popovich, colonel and legendary MiG test pilot, campaigned publicly for continued investigation and published research on the phenomenon. The documents were later broadcast in the West by investigative journalist George Knapp. The release came under Gorbachev-era glasnost policies that allowed limited disclosure of previously classified military anomaly data.