Syria airstrikes against ISIS costing an additional almost $ 500 million a week , Mark Ensalaco notes . In a letter to the U.N. secretary-general presented by U.S . ISIS estimates there are 4.1 million Iraqi refugees . U.S. must place greater emphasis on humanitarian aid in Syria , Ensalaco says .
Syria airstrikes against ISIS costing an additional almost $ 500 million a week , Mark Ensalaco notes . ISIS estimates there are 4.1 million Iraqi refugees . U.S. must place greater emphasis on humanitarian aid in Syria , Ensalaco says .