Concluding with a blog entry the source Russian controlled [?] media. Once more also thanks to Jay for the tip.
"US Spy Plane Pilot Reveals Mysterious Soviet 'Dome of Light' Superweapon"
"A retired US pilot, who flew a reconnaissance plane during the Cold War, has made a revelation about one of his missions aimed at spying on Soviet ballistic missile launches. Speaking with The Drive, Veteran Air Force pilot Robert Hopkins has revealed that while he was monitoring tests of the Soviet SS-20 Saber intermediate-range ballistic missile, he and his colleague witnessed what he called a 'Dome of Light'."
A "dome of light" for which their is no reasonable scientific explanation? The secret Soviet weapon Cold War?
Some clarification here. SS-20 as seen by NATO military planners as a potential war-winning weapon for the Warsaw Pact alliance. SS-20 developed, tested and fielded totally in SECRET. The existence of the SS-20 only as known and the appreciation of which determined by a combination of intelligence gathering, reconnaissance, surveillance and traditional old-fashioned espionage.
SS-20 as a weapons system an important factor in the negotiation of the INF treaty. That treaty both the USA and Russian now having been abandoned and most recently too!
Space aliens or what? Something much more mundane probably but again, what?