Defense ministers from Syria, Iran and Russia are scheduled to meet in the Iranian capital, on Thursday, to discuss fight against terrorism and latest regional developments.

Syrian defense chief Fahd jasim al-Freij and his Russian counterpart, Sergey Shoygu, will fly to Tehran upon the invitation made by the Iranian Defense Minister Brigadier General Hossein Dehqan.

The tripartite meeting comes as the war against the Islamic State of Iraq and Syria (ISIS) has reached a critical phase with the Iraqi Army approaching the group’s stronghold of Fallujah and US-backed Syrian Democratic Forces (SDF) are marching on the group’s bastion in northern Syria. Meanwhile, the Syrian Armed Forces, backed by Russian air force, have started a wide-scale military operation to liberate ISIS’ capital of al-Raqqa.

Russia and Iran have been staunch supporters of the Assad’s government in fight against hardline militants across the war-torn country.

Recently, Russia stated that it will provide ‘strongest air support’ to Syrian Army in the northern city of Aleppo.