The Caliphate’s greatest target will be Saudi Arabia because of the “holy” cities of Mecca and Medina.
Imagine the prestige ISIS will enjoy among the Muslim countries if it can lay claim to these places.
Given that ISIS is trying to bypass Bahgdad, and grab the Shiite holy cities of Najaf and Karbala, Shiite Iran will undoubtedly be in on the fight bigtime. They may act directly or they may match the financing that ISIS has managed to steal. Give their strong statement that all Muslims must take a loyalty oath, and that they do not consider Shia true Islam. Sunni Saudi Arabia is against them and the Shia portions of SA and Bahrein will be against them. THey truely have bitten a poison reptile.