Published: 11 December, 2009, 13:38

A UFO has circled the Kremlin – well, that's if you believe a short clip which has soared to the top of YouTube as Russia’s most viewed videos.

The film, apparently shot from a passing car, has become a sensation.

Another YouTube clip shot in daytime shows a grey object in the sky near Red Square.

However, skeptics say that if the images were for real, the public would have reported the sightings to police – who have made no comment on the issue.