The earthly or extraterrestrial origin of the UFOs was never determined, but some military officials believed they knew how to summon them, Russia Beyond the Headlines writes:
The Soviet Union took UFOs seriously. The KGB and the Soviet Defense Ministry had dedicated units collecting and analysing information about paranormal activity. Military experts even claimed to know how to “summon” UFOs and make contact with them.
The source for this is a retired FSB major general and researcher, Vasily Yeremenko. Yeremenko was in charge of the KGB division overseeing the air force and aircraft manufacturing. This division was entrusted with the task of collecting all reports of UFO sightings.
[In the 1970s], as Yeremenko told RBTH, there had been an accumulation of reports on numerous paranormal incidents. Missile Troops units were even instructed on how to behave in the event that they spotted a UFO: the main thing was not to act in a way that could create an opportunity for a retaliatory aggression.
In the early 1980s, an experiment to “summon” a UFO was staged at a military range in Astrakhan Region. By then, experts had realized that UFOs were frequently sighted in areas of “heightened tension” – for instance, during weapons tests, or when there was a lot of military hardware gathered in one area.
“One could say that, during that experiment, we learned how to summon a UFO. To achieve that, there would be a sharp increase in the number of flights performed by combat aircraft and a lot of movement of hardware.” Yeremenko said. According to him, most of the objects looked like luminous spheres.
The military, together with the scientists who took part in the experiment, came to three main conclusions. First, these may be natural phenomena that modern science is not yet able to explain. Second, these may be U.S. or Japanese reconnaissance equipment. Finally, these may be extraterrestrial objects.