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The obvious answer for many is either let them come home if home is in the west, if not, they're refugees not fighters, move them to the west.
“What will become of the foreign fighters who joined ISIS, and their families?”
Kill every last one of them. Then kill their pet goats. Feed the corpses to wild dogs.
L
“we cannot talk about a sustainable peaceful environment in the short term for the Middle East.”
The Middle East hasn’t been peaceful in 3,000 years. It won’t be peaceful for another 3,000 years. Trying to force “peace” on them is a fools errand. There’s only one way the ME will ever be peaceful and no one, and I do mean no one, has the stomach for it.
L