Two brothers, one dead one at large are from Dagesthan, little Islamic republic in th middle of the Russia next to Chechnya. They were both born in Mahachkala...the capital of Dagestan. They have very little to do with Russians who mainly are orthodox christians.They were successful students , very young and had the whole life in front of them. Why would they throw it all away?
Somebody turned them into jihadists while ago. These young muslims meet their radical brothers of faith, get brainwashed and their heads are turned. From there on out they are on the mission to fight infidels on their way to paradise. In UK they send such recruits to training camps in Pakistan when they return they often are used on suicide missions. Innocent people die. Often these recruits are born and rised in UK.They live among us - in restaurants, busses, subway. It is terrifying!
Great English movie that talks about all this is " Cleanskin" ( 2012). Watch it and you will understand the dynamics of all this. http://www.youtube.com/watch?v=SwjhaBCZIiI