Senior representatives of Pakistan, Saudi Arabia and Turkey are scheduled to convene with Iranian officials in Tehran on Monday to discuss regional security and coordination, Reuters said.
Saudi Arabia will be represented by Defense Minister Prince Khalid bin Salman; Pakistan will send Chief of Army Staff and Chief of Defence Forces Field Marshal Asim Munir; and Turkey's intelligence chief Ibrahim Kalin is also expected to join.
Iranian official Ali Bagheri Kani confirmed the visit, noting that the delegations will consult Iran's Supreme National Security Council on security matters.
This gathering will be the first high-level engagement between Iran and all three bloc members since Saudi Arabia faced increasing attacks from Yemen's Iran-aligned Houthis. Saudi forces intercepted another wave of missiles and drones on Sunday as clashes with the Houthis continued.
Munir traveled to Tehran last week, meeting President Masoud Pezeshkian and other senior figures. Iranian officials said at that time that no talks with Washington would occur until Tehran's demands were satisfied, according to local media.
Pakistan has acted as a mediator between the United States and Iran. Earlier mediation led to an interim peace deal in June, which quickly fell apart as hostilities resumed weeks later.
The talks come after an emergency Mecca Pact meeting in Riyadh earlier this month, where members agreed on the "rapid deployment" of military forces and capabilities in Saudi Arabia.
Pakistan, Saudi Arabia and Turkey signed the Mecca Joint Defence Agreement in August. The pact treats an armed attack on any member as an attack on all and permits the use of "all necessary means" to protect members' territorial integrity, sovereignty or internationally recognised borders.
Pakistan approved the agreement last week, while Turkey's parliament began ratification earlier this month. Officials from Saudi Arabia, Pakistan and Turkey did not immediately respond to requests for comment, Reuters reported.
