It would be interesting to know a bit more about how efficient the transfer from the oil $ to the islamist fighters is. Tapping into the arsenals of the respective states should greatly ease the logistics and enhance the efficiency of the operations but as far as I know it left too obvious signs.
I have read little about the Syrian economy which must be in a terrible, terrible state and it is quite likely that USD, maybe somewhat intermixed with Euros has become the currency of choice in many areas.
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