ISIL or ISIS was a CIA founded group to attract all the Islamicists by claiming to wage war against the US.
They were used to attract jihadists across the world and keep them contained, where they could be killed and limited in their actions.
https://efile.fara.gov/docs/6845-Informational-Materials-20201116-56.pdf
FFS. Give it up
Bragged about funding "asymmetric warfare" against Russia.