I have followed this subject for decades.
This is a “one of a kind” case—which means it is almost certainly Soviet disinformation.
Boris and Ivan got to work one morning and said “What’s the most stupidly outrageous story involving aliens we could feed those gullible Americans?”
So we got this.
For a time, as the Soviet Union collapsed, a lot of genuine, highly secret material flowed out of their archives, usually for cash and a ticket to the West. With a buyer’s market, the CIA seems to have gotten a few gems. Perhaps this is one of them.
It seems the Soviets didn’t have much luck with aliens. frank Edwards claimed in one his books that 3 cosmonauts, a woman crew member included, were stranded in space when their space capsule was disabled by a UFO.