They Left to Join ISIS. Now Europe Is Leaving Their Citizens to Die in Iraq.

A man suspected of belonging to the Islamic State group, who spoke to journalists in French, leans on the back of a truck as he waits to be searched by members of the Kurdish-led Syrian Democratic Forces just after leaving the Islamic State's last holdout of Baghouz, in the eastern Syrian province of Deir Ezzor on March 4. BULENT KILIC/AFP/Getty Images


BAGHDAD—There was no other way out. After months under siege in the Syrian city of...