"It will feed the narrative being spread by the Islamic State that they are the only viable option in terms of defending Sunni rights," he said. "Many Sunni states, including Saudi Arabia and Jordan, may not be willing to publicly and fully engage in this process. They are worried about the challenge to their own legitimacy of fighting other Sunnis."
"While the U.S. may provide the leadership, it is important in terms of both resources and legitimacy for Arab states to be seen to be leading the process on the ground," said Julien Barnes-Dacey, who specializes in Middle East affairs at the European Council of Foreign Relations in Britain. "A key element would be in terms of mobilizing, training and arming Sunni fighters [in Syria]."