The Pentagon expects to fight the Islamic State from Iraq, a senior defense official said today, as American troops are set to leave northern Syria under pressure from a Turkish offensive probing deeper into the war-torn country than the Defense Department anticipated.

Both the Arab League and the Gulf Cooperation Council have already classified the Iran-backed Lebanese Hezbollah as a terrorist organization.

France and Britain on Tuesday accused Turkey and the United States of undoing five years worth of work in fighting Islamic State and scrambled to define how to react should militants escape prisons and camps in Syria.