I've seen the video(s), they basically rip out his genitals. Then they shoot him and drag him to ditch.

They're mostly Chechens but the main actor is a Kalmyk (one of Russian Mongol groups).

There's a video I didn't see where they also cut off another dude's hands and head, and then plant the head on a fence.

I wanted to see it too, then I thought nah I don't.