Mehdi Karroubi had stopped eating to demand the removal of agents from his home and a public trial.
The move comes after the first high-level meeting between the two neighbours since ties were cut.
Emad Mishko Tamo, 12, was separated from his family after being captured by IS in 2014.
Mosul faces struggles with reconstruction and reconciliation
Netanyahu criticised for silence over Trump on Charlottesville
Teens brainwashed by IS fleeing to Europe
Inside Saudi town devastated by demolitions and fighting
Maps and graphics reveal the devastation caused by the battle
Saudi Arabia's missing princes
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Broadcast time 08:50 BST - 09:00 BST
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Broadcast time 11:06 BST - 11:30 BST