Where ever the cash or guns is coming from it flies into Turkey and is smuggled into the Syria border. This is actually how the CIA delivered arms to the Sunni rebels
C.I.A. Said to Aid in Steering Arms to Syrian Opposition
WASHINGTON — A small number of C.I.A. officers are operating secretly in southern Turkey, helping allies decide which Syrian opposition fighters across the border will receive arms to fight the Syrian government, according to American officials and Arab intelligence officers.
http://www.nytimes.com/2012/06/21/world/middleeast/cia-said-to-aid-in-steering-arms-to-syrian-rebels.html?pagewanted=all&_r=0
Where they get their funding isn't a big secret but they also export oil on the black market.
Royal Donors in the Gulf
Grossing as much as $40 million or more over the past two years, ISIS has accepted funding from government or private sources in the oil-rich nations of Saudi Arabia, Qatar and Kuwait—and a large network of private donors, including Persian Gulf royalty, businessmen and wealthy families.
Until recently, all three countries had openly given hefty sums to rebels fighting Bashar Assad’s Syrian regime, among them ISIS. Only after widespread criticism from Secretary of State Hillary Clinton and the international community did Saudi Arabia pass legislation in 2013 criminalizing financial support of terrorist organizations such as Al-Qaeda, Al-Nusra and ISIS.
Lori Plotkin Boghardt, a fellow in Gulf politics at the Washington Institute for Near East Policy in Washington, D.C., tells Newsweek that private donors across the Persian Gulf are continuing to funnel money to ISIS. “Qatar and Kuwait continue to stick out as two trouble spots when it comes to counterterrorist financing enforcement,” she said. Continued financial sanctions imposed on Kuwait and Qatar terrorist financiers by the U.S. Treasury “suggest the U.S. government continues to be concerned about spotty, to say the least, Kuwaiti and Qatari enforcement of their counterterrorist financing laws.”
A couple of factors are frustrating attempts to dam these rivers of cash. First, the relatively open banking systems of Qatar and Kuwait are being skillfully exploited by ISIS, since, unlike Saudi banks, they do not automatically raise red flags when money is siphoned to Islamist causes.
Second, Qatar and Kuwait are loath to limit the activities of highly influential ISIS donors due to the political fallout such intervention may cause. In Kuwait, a family of parliamentarians—including Kuwaiti member of parliament Mohammed Hayef al-Mutairi—has raised funds for jihadist groups with direct ties to ISIS. “Cracking down on some ISIS financiers is politically complicated for these countries’ leaderships,” Boghardt says.
http://www.newsweek.com/2014/11/14/how-does-isis-fund-its-reign-terror-282607.html
I think the only way they can be defeated is politically, not saying the army can't be crippled but all sides need to come up with a political solution to deal with how with either a land or government situation in Iraq, and what to do here in Syria who the rebels & ISIS do if they defeat the government.
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