Mystery UFO halo over Moscow

[JD10]

I think NASA need to think about what is a UFO and what isn't. It's a light cloud in a dark cloud :doh

 

[_Nabeel_]

ohh its just a cause of refraction of light of slanting rays of sun....(i think:sarcasm)

 

[MaD]

I figured it out!
It's an optical illusion that illuded the whole city!