Hezbollah says ready to pull forces from country after IS defeat

In a televised address on Monday evening, Nasrallah said the Lebanese movement had deployed "large numbers of our commanders and cadres" to Iraq to fight IS.

"We consider that the mission has been accomplished, but we are waiting for the final, Iraqi announcement of victory," he said.

Once that official declaration came, Hezbollah would reassess its presence in Iraq and may pull its members out.

"If we find that it's over, that there is no need for the presence of these brothers, they will return to be deployed in any other arena that needs them," Nasrallah said.

Hezbollah mostly deployed experienced commanders as advisers and trainers to work alongside the Hashed al-Shaabi, a paramilitary umbrella dominated by local Shiite militia groups also loyal to Tehran.

Iraqi forces on November 17 announced they had retaken Rawa, the last town to have been held by the Islamic State group in Iraq, capping three years of anti-jihadist military operations.

The latest efforts against IS have been spearheaded by Iraqi special forces and other regular troops but the Hashed, which counts tens of thousands of fighters, has been a key component of the bruising campaign.

While IS no longer controls any urban hub in Iraq, its surviving fighters have regrouped in remote desert areas along the border with Syria and mopping up operations remain to be completed.