I saw this on Current Affairse (Retrogames board). I'm not quite sure why I have decided to show a link to it here, but this disturbed me even more than that twisted executions video I rented out a while back.
I felt distinctly sick after watching this, not only physically but mentally as well. Quite how one person could without any qualms do this to another is beyond my understanding.
To put it briefly, in about 1998 the Russians were having problems in with Chechnian terrorists. Russia were having problems with terrorists capturing peasents and soldiers then demanding ransom for their safe return. The only problem was that no one was paying. So they started making videos of them mutilating/killing their hostages.
A warning comes with this link,it is very disturbing, so only click if you feel you can handle it.
http://www.rangerarms.com/images/gh-czech1.mpeg