How do you know that?
Sky News has better CCTV footage from outside. Those guys were not Russian regular troops. They even had the identifying arm bands on. The irregulars are a scruff bunch and use the arm bands to identify themselves. It saves themselves getting shot at by Russian troops that think that they might be Georgian irregulars.
All armies and armed forces have thieves in them. In time of war and conflict looting and theft are no stranger. It is easy to jump on the bandwagon and not consider that US and Coalition troops do exactly the same. A minority yes, but think of how much money and gold went astray in Iraq during 2003! Not every soldier, regardless of nationality, is squeaky clean.
http://www.thesun.co.uk/sol/homepage/news/justice/article1057284.ece
http://www.usatoday.com/news/world/iraq/2003-04-23-stealing-usat_x.htm