It's the Novaya Zemlya effect where light from something over the horizon is reflected off the upper atmosphere. It's likely a mirage of the moon.

Exhausted fuel from a Russian rocket.

https://www.hooktube.com/watch?v=OwuDveBbAvo | https://www.hooktube.com/embed/OwuDveBbAvo :

RAW: Mysterious giant ball of light stuns people in Siberia - YouTube

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