As for the original question as to why it seems that Russians go around killing non-russians:
I think i remember something about Klaue and Co. going around in W1 or W2 killing anyone they found speaking russian to help reduce lag. I also remember a topic about a "jihad against russians" or something. Some are still bitter, and that got passed on from world to world.
Ah, here it is: viewtopic.php?f=9&t=4645&hilit=jihad#p52124