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 .
U.S. airstrikes against ISIS costing around $ 52 million a week , Mark Ensalaco notes . United Nations estimates there are more than 3 million Syrian refugees . U.S. must place greater emphasis on humanitarian aid in Syria , Ensalaco says .