The US State Department has been somewhat reticent in formally naming the 40 or so countries it has signed up in the fight against Isis militants, who call themselves the Islamic State.
But as LSE Professor Fawaz Gerges, a specialist in Middle Eastern politics, told i100, only four really matter in the fight against the Sunni terror group: Saudi Arabia, Jordan, Turkey and the United Arab Emirates.
Saudi Arabia, which is a Sunni state, has already agreed to host a base to be used for training Syrian opposition fighters, while Turkey has said it will not allow America to use its major base at Incirlik to launch air strikes. Separately Jordan has a connection with Sunni tribes in Syria and Iraq while the United Arab Emirates has financial clout.
The Americans recognise that the most effective means to degrade and dismantle and ultimately defeat the so-called Islamic State is to build a Sunni dominated coalition of regional powers who basically have the weight and the legitimacy to convince Sunni communities in Iraq and Syria to keep their distance from Isis or stand up and take on Isis themselves.