International terrorism is evolving.
Noting how crazies who are nations get away with murder (Think: Russia, Iran or North Korea), Islamic terrorists have decided to be a nation, too. Being a state gives advantages that Al-Qaeda, Hezbollah, Boko Haram, and various splinter terror groups have not enjoyed. For one thing, they can almost count on Russia as a partner.
There is no end to the variations of people who hate the status quo nor the means they will go to to destroy it, but we should be especially wary of the overlap of terrorism with nation-state status, as the Islamic State is attempting.
The next step? Combining a terrorist state with nuclear weapons capability. Oh, we already have that: the above named crazies.
Thus terrorists evolve into state sponsors of terrorism.