I just remembered, some Middle Eastern friend told me, that the most scary radical Muslims are the Chechens. ISIS had a lot of Chechens and other Russians as members. As a matter of fact, ISIS military leader was Chechen.
Chechen scary? Why Chechen singled out? In recent Chechen wars despite of this name we fought not with Chechen particularly but with Wahhabis islamists. Yes Chechens were biggest part of those islamists but not all. And many moderate Chechen fought on government side against islamists. Like father of today head of Chechnya Kadyrov. He was moderate islamic cleric so was a mortal enemy of those islamists. They killed him by bomb but his son now rules a modern Chechnya.
When there was a recent war on Caucasus our speznaz had been beating a those Wahhabis all the time. They were good in taking hostages and planting bombs and in ambushes but in the real fight with soldiers they were always beaten. And Chechen moderates fought good in the militia and Russian army. SO Wahhabis ran away out of Caucasus into western Europe and establish their order there)))... Which is funny but God justice on those who supported then in fight with Russia.
So they are just people you should not trust blindly but if you cautious and you will be ok.