Cloud over Moscow city

EDIT: LINK UPDATED! FIGHT THE POWER!

We've seen video of this odd luminous, ring-shaped cloud over the city of Moscow appearing on the internet for the last few days. At this point it is getting posted on several pretty legitimate news websites, so presumably it's not a home video hoax. Two things spring to mind though; One, I'd like to be the first to welcome our new alien overlords and Two, How come there's only one dude on the whole of Moscow with a camera phone?