This picture featured in Our Strange World claims to be a flying saucer that was made for the Russian Air Force in the 1950’s. I wouldn’t doubt that the Russians had at some point pursued something along the lines but I think this particular photo fits under the heading, “Fun with Photoshop”.
You will note the left edge of the saucer facing us is reflecting strongly in our direction suggesting a light source behind our left shoulder, however, the jet in front of it is not illuminated in this same region.
Additionally, I doubt the Russians would leave such an item parked out in the open for our spy planes and satellites to photograph, let alone allow their military personal to distribute photographs. It has also weathered remarkably well for a fifty year old aircraft.