It follows reports of a UFO hurtling towards Earth in the nearby Irkutsk region of Siberia one month ago.
'We couldn't believe it when we saw it. And what was spooky is that there was no sign of the spaceship. Perhaps that was taken away and the body overlooked,' said Igor Molovic, one of the pair that uploaded the video.
The clip has now been seen by nearly 700,000 people within a few days.
Cynics claim the video is a fake using a carefully staged model for the alien's body.
But one fan wrote': 'It's so lame how people always get thrilled by having another excuse to shout "Fake! fake!" every time something weird shows up. Unless proven otherwise, this is in fact plausible