(2)A group of Soviet MIG-21s can be seen chasing a fast-moving, cylinder-shaped UFO in a video clip(1) from an unknown documentary posted at Google Video. This screenshot (pictured) shows the estimated size of the UFO compared to a MIG.
Several readers have identified this clip as coming from 'The Secret KGB UFO Files' which aired on TNT in 1998.

1. http://video.google.ca/videoplay?docid=-4468185100897567649&q=ufo+cylinder
2. http://video.google.ca/videoplay?docid=-4468185100897567649&q=ufo+cylinder