The head of the powerful Iraqi Shiite militia Harakat Hezbollahinfo-icon al-Nujaba pledged on Tuesday to stand alongside its Lebanese ally Hezbollah if a new warinfo-icon breaks out with Israelinfo-icon.

Harakat Hezbollah al-Nujaba and Hezbollah have fought side-by-side to bolster Syrian government troops since 2013, most prominently against the Islamic Stateinfo-icon terror group in eastern Syriainfo-icon.

On Tuesday, the movement's secretary general Akram al-Kaabi visited the tomb of top Hezbollah commander Imad Mughniyeh to commemorate the 10 years since his death.

"We in the Iraqi resistance stand with Hezbollah, and we will stand with Hezbollah in any Israeli attack or action against it," Kaabi said.

He pledged to fight "with Hezbollah in a single row, on a single front, just as we stood with them on a single front in Iraqinfo-icon or Syria."

Kaabi spoke in Beirut's southern suburbs, where Hezbollah has a strong support base.

Both Harakat Hezbollah al-Nujaba and Hezbollah are backed by Iraninfo-icon. They fought alongside Syrian government troops and other allied groups to oust IS from key cities in eastern Syria last year, including Albu Kamal.

Hezbollah has also dispatched top commanders and advisers to Iraq to help the paramilitary Hashed al-Shaabi force.

In June, Hezbollah chief Hassan Nasrallahinfo-icon warned that hundreds of thousands of Arab and Musliminfo-icon fighters would be ready to fight against Israel in a future war.

It "would open the door for hundreds of thousands of fighters from all around the Arab and Islamic worldinfo-icon to participate in this fight -- from Iraq, Yemeninfo-icon, Iran, Afghanistaninfo-icon, Pakistaninfo-icon," he said.

Kaabi is the second top Iraqi militia leader in recent months to come to Lebanoninfo-icon in a show of support to Hezbollah.

Senior Hashed commander Qais al-Khazali, who heads the Asaib Ahl al-Haq militia, visited southern Lebanon in December.