The video is describing a terrestrial cause. I just use the phrase" lights in the sky " as an example.
From Atmanaki Georgiy Vladimirovich testimony.
"On February 17, I and Vladimir Shavkunov got up at 6 am to prepare breakfast for the group. After making a fire and preparing everything necessary, we waited for the food to get ready. The sky was gray, there were no clouds, but there was a slight haze, which usually dissipates with the rising of the sun. Sitting facing north and accidentally turning my head to the east, I saw 30° high in the sky a milky white blur about 5-6 moons in diameter and a series of concentric circles. It resembled a halo around the moon in a clear frosty weather. I made a comment to my partner, that's how they painted the moon. He thought and said that in the first there is no moon, and besides, it should be on the other side. From the moment we noticed this phenomenon, it lasted 1-2 minutes, and how long it was there
before we noticed it we don't know. At this moment, at the very center of this spot, an asterisk flared up, which for a few seconds remained the same size, and then began to increase sharply in size and rapidly move in a western direction. Within a few seconds, she grew to the size of the moon, and then tearing off the smoke screen or clouds appeared a huge milk disc of milky color, 2-2.5 moons in diameter, surrounded by the same rings of pale color. Then, remaining the same size, the ball began to fade until it merged with the surrounding halo, which in turn spread out across the sky and went out. It was dawn. The clock was 6.57, the phenomenon lasted no more than a half minutes and produced a very uneasy impression. Initially, we did not pay attention to it, but then, when the glowing disk itself appeared, we were amazed. Personally, I had the impression that some heavenly body was falling in our direction, then, when it had grown to such enormous dimensions, a thought flashed through my head that another planet came into contact with the Earth, that now a collision would follow and nothing would remain of all earthly things. We were already awake for more than an hour, so we were well awake and didn't believe in hallucinations, but we just stood there hypnotized and only when the disc began to fade we rushed to the tent back
to wake up our comrades and show them the unusual phenomenon. I do not know how Karelin managed to jump out of the sleeping bag at lightning speed and run outside the tent in his underwear wearing only socks. He managed to see the disc losing its outline and the bright spot spreading across the sky."
We have the time of day and the date. The time of day fits with the said twilight effect . The description of what was sounds similar to what we can see on the video. I would put this forth as" a most likely explanation" . A rocket getting launched .