Yes, you're talking about Caliphate. This guy's rhetoric makes it obvious that there's no point in anyone using diplomatic means with him. If the people of Iran don't want a bloodbath soon, they better do something about him.
yep yep. That's one thing that worries me. If the Muslims quit killing each other, focus their efforts, and reestablish the Caliphate (they would have to agree on a Caliph, which hasnt happenend in HUNDREDS of years)...if all that happened, theirs would be a force to be reckoned with.