I’ve been thinking about this ISIS situation. If Iraq had defended its border with Syria, instead of letting ISIS maniacs roam back at forth at will, ISIS never would have had the ability to take over a huge part of Iraq without a wimper. It all goes back to the US working to topple Assad, and Iraq giving those “friendly freedom fighters” we arm and train free movement.
The Iraqi govt had been fighting against ISIS, they also built a giant berm to stop crossings.
Turkey had waved across lots of rebels to fight Syria though, maybe you’re thinking of them