Bizarre Pac-Man UFO Over Russia 2013

A resident of Stavropol photographed from the window of his house a strange unidentified flying object, a white rectangle with two holes, vaguely reminiscent of a bus or in my opinion a ghost from Pac-Man.

A UFO expert who was shown the pictures stated that it could just be a camera artifact, or possibly a hoax.

Further analysis of the pictures confirmed the object was not added to the original. 

The question remains just what was that strange object above the skies of Stavropol?