Russia has a sear like a necklace around his neck made from barbed wire used to choke him, causing him to never take off his scarf in front of anyone unless he really trusts them. The injury to his voice box from that incident caused him to retain his high pitched and child like voice that gets quieter and quieter the madder he gets. The baltics say that when he is really mad, his voice gets to hoarse and quiet that you will probably not hear your death coming. That is why he prefers to mutter kolkolkolkol since it is easier sound out with a quiet voice.
