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.