1. ISIS was created by the USA just like how they created the Mujahideen which later was rebranded as Al Qaeda, here's an interview with the founder of Jihad in Egypt and a former buddy of Al Qaeda's chief: ISIS, the Bombshell Interview to Impeach Obama.
2. NATO, mainly the USA, Turkey, Britain, and others have been moving these ISIS terrorists around where needed: Erdogan Sending Syrian Muslim Brotherhood Terrorists to Afghanistan and Turkey and Russia.. Central Asia after Afghanistan?
3. John Kerry, Hillary Clinton, and other US officials admitted they were using ISIS to pressure President Assad who instead brought in Russia and the whole world's balance started to get fixed: The Pentagon Threatening to Revive ISIS

The USA and its NATO buddies cannot wage direct wars like before, they found they can use proxy groups 'to benefit much more without boots on the ground' as one of the US strategists once described their future wars a couple of decades ago.