WForeign involvement in the Syrian Civil WarWForeign fighters in the Syrian and Iraqi Civil WarsWForeign fighters in the Syrian Civil WarWMilitary intervention against ISIL aerial order of battleWAnna CampbellWForeign fighters in the Syrian Democratic ForcesWHezbollah involvement in the Syrian Civil WarWInternational military intervention against ISILWIran–Saudi Arabia proxy conflictWIran–Turkey proxy conflictWIranian involvement in the Syrian Civil WarWJamie JansonWJordanian intervention in the Syrian Civil WarWRussia–Syria–Iran–Iraq coalitionWRussian involvement in the Syrian Civil WarWSaudi Arabia–Turkey proxy conflictWTurkish involvement in the Syrian civil war