Previouly militants from Iraqi communist party helped the Russians in a similar situation. Likely the kidnappers were mere criminals amd needed only money but they were hinted about the fate of kidnappers in Lebanon where severed penis was sent and it was a very effective argument. In Lebanon 3 diplomats had been released immediately (one was previouly killed).
What was one of those golden rules? Don't mess with the Russians!!
Good for them, well done on getting their people back quickly and sorting out the bad guys so they won't be kidnapping any one else.
Only a shame all the kidnaped are not rescued so quickly by their own nations.
Iraq is a newborn democracy and namely US troops have to ask the permission from democratically elected Iraqi government. I doubt that there are many Russian operatives in Iraq (quite few). In Lebanon Druzes helped the Soviets. There is propably a net of militants that have Russian support (financial, military and logistical).