I think Ambassador Lamani said it correctly, that Turkey is not a country like Chad or Mali. It has tremendous military intelligence resources. I have heard many sources explaining how, for example, members of the al-Nusra front were moving freely across Turkish border points.
So it is not a secret that Turkey has tried to establish its own sphere of influence in northern Syria using these Islamist elements, but the Islamist elements are incredibly complex and there are many shifting alliances. So what we call ISIL could itself be transformed many times over as new alliances are struck. Part of an effective solution, beyond military strikes, is to give an incentive to those Islamist elements to defect from ISIL and to be given some other constructive role in the future of Syria.