A 10-nation group the Obama administration has gathered to fight ISIS could help, but more important will be the nations that surround the Islamist militant group's self-declared "caliphate," experts say.
After meetings at last week's NATO Summit, U.S. Defense Secretary Chuck Hagel spoke of a newly formed "core coalition." President Barack Obama said it would take on ISIS. The nations are Australia, Britain, Canada, Denmark, France, Germany, Italy, Poland and Turkey, in addition to the United States.
Turkey, a NATO member, is the only nation in that group located close to ISIS, which is also known as ISIL and calls itself the Islamic State. It has taken over parts of Iraq and Syria.
This month the United States plans to ask the U.N. Security Council to support a resolution aimed at cracking down on foreign fighters in ISIS, a U.S. official said. And U.S. Secretary of State John Kerry says he'll be heading to the Middle East on Tuesday to work on building a broader coalition to defeat the Islamist group.
The key to winning the battle against ISIS, analysts say, could be courting countries in the region.
"The most important element of this coalition is the local and the regional," said Fawaz Gerges, chairman of Middle Eastern studies at the London School of Economics.
"The U.S. and allies won't put boots on the ground. ... The Iraqis, Kurds, and Syrians will basically be doing the fighting."
Defeating the group known for horrific acts of terror -- seizing towns, slaughtering civilians, beheading many people including journalists -- will demand much more than military action, said Gerges. "The most important element is to deny ISIS its social oxygen."
ISIS has blended in with local communities "to portray itself as defender," he said.
Members of the persecuted Yazidi community in Iraq told CNN that after ISIS came into town, Arab neighbors turned on the minorities and helped ISIS kill.
Stopping ISIS means convincing Sunni Arabs -- who have felt disaffected by the Iraqi government -- that ISIS is an enemy. The goal is to "drive a wedge between local Sunni communities and ISIS," Gerges said.
To that end, Saudi Arabia and Jordan, which are Sunni states, can play a critical role, Gerges said. They're home to many Sunnis, including former Iraqi military officers who fled after the U.S. invasion in 2003. "I bet you U.S., Saudi and Jordanian officials are working 24 hours a day to try to convince these leaders to join their alliance, and to in turn convince their counterparts to stand up against the Islamic State."
"Saudi Arabia is the only authority in the region with the power and legitimacy to bring ISIS down," two analysts write in The New York Times.
The country "effectively eradicated al Qaeda in the kingdom," write Nawaf Obaid of Harvard's Belfer Center and Saud al-Sarhan of the King Faisal Center for Research and Islamic Studies. It also "has a unique form of religious credibility and legitimacy," since Saudi Arabia is the epicenter of Islam.
Having Saudi Arabia "in the lead can only add to the legitimacy of the campaign against ISIL," said Dennis Ross, a former U.S. ambassador who is now with the Washington Institute for Near East Policy. "The Arab states in this campaign must also provide military support -- involving forces, arms, training, subsidies for the tribes, intelligence, and diplomatic and even religious efforts to discredit ISIL."
These efforts could bring about an alignment between Saudi Arabia and Iran in fighting the militants, said Stephen Biddle, a political science professor at George Washington University.
"The Middle East is characterized by a welter of conflicting fault lines and interests," he said. When Muslim nations have aligned along Sunni and Shia lines, Saudi Arabia and Iran moved further apart, "and in fact waged a proxy war against each other." Now, Biddle said, new fault lines pit radical groups against authoritarian governments threatened by them -- and on that, the two nations could come together.
Trita Parsi, president of the National Iranian American Council, believes Iran is even better equipped to fight ISIS than Saudi Arabia is.
"The Iranians have far more battle experience, particularly with asymmetric warfare, as well as fighting against guerrilla forces," he said.
But Michael Rubin of the American Enterprise Institute cautions against the U.S. coordinating with Iran.
"Some diplomats might say because the United States and Iran have a mutual interest in seeing ISIS defeated, we should work together. That's like saying because arsonists and firefighters both have an interest in fires, they should work together," Rubin says. "Iran seeks not to defeat terrorism, but swap one flavor for another."
Iran's and Syria's regimes are close, so Iranian involvement would create the "awkward political problem of what you do with Syrian President Bashar al-Assad," says Biddle. "This is not unlike the problem of politics generally. When you build coalitions, not everybody likes every policy."
(CNN)