Turkey's parliament approved the Mecca Joint Defense Agreement on Thursday by 279 votes to 119, completing a major legislative step toward Ankara's participation in a security arrangement that treats an attack on one member as an attack on all three.
The agreement, signed in August, provides for intelligence sharing, military coordination, joint deterrence and defense industry cooperation. It does not automatically authorize Turkish troop deployments, which would require separate parliamentary approval.
The pact builds on an earlier Saudi-Pakistani defense agreement and reflects Riyadh's efforts to diversify its security partnerships amid the wider conflict involving Iran, the United States and Israel.
Although the pact predates the latest attacks on Saudi Arabia by Iran-backed Houthis, those attacks have given its collective-defense commitments more immediate significance.
Houthi attacks put defense commitments to the test
The three countries agreed during consultations in Riyadh in September to implement collective-defense measures, including arrangements for the rapid deployment of agreed military forces and capabilities to Saudi Arabia.
The decision came as fighting intensified in Yemen, with Houthi forces launching missile and drone attacks against Saudi targets and Riyadh resuming military operations against the group.
The Houthis have described some of their attacks as retaliation for Saudi airstrikes in Yemen. Reuters reported in September, citing Iranian and regional sources, that Iran's Revolutionary Guards had helped direct a Houthi offensive along Yemen's Red Sea coast and that Tehran had encouraged further attacks on Saudi Arabia.
Yemen's internationally recognized government made further allegations this week, accusing Iranian and Hezbollah personnel of directly helping manage Houthi military operations.
Interior Minister Ibrahim Ali Haidan said Tuesday that 14 members of Iran's Revolutionary Guards and seven Lebanese Hezbollah experts were involved in planning operations, developing missile and drone capabilities, and coordinating attacks on international shipping.
Haidan said decisions were made in Tehran and announced in Sanaa, accusing Iran of moving beyond financing, arming and training the Houthis to directly supervising their military activities.
Iran's Foreign Ministry denied Thursday that Iranian military experts were operating in Yemen. Hezbollah rejected the allegations Wednesday, saying it had no personnel working with the Houthis and describing the accusations as baseless.
The allegations and denials come as Saudi Arabia weighs how to respond to Houthi attacks and what military assistance it could receive from its new defense partners.
Turkish officials have indicated that Ankara's contribution would initially focus on equipment, intelligence and weapons systems, Reuters reported. Defense Minister Yasar Guler has said Turkey does not envisage its troops engaging in combat or offensive operations against the Houthis.
Opposition lawmakers warned during Thursday's parliamentary debate that the agreement could draw Turkey into regional wars. Government representatives said any troop deployment would require separate parliamentary approval, according to the Associated Press.
Defense partners keep diplomatic channels with Tehran open
Despite their expanding military cooperation, Saudi Arabia, Turkey and Pakistan have also pursued direct talks with Iran in an effort to prevent another regional escalation.
Saudi Defense Minister Khalid bin Salman, Pakistani army chief Asim Munir and Turkish intelligence chief Ibrahim Kalin met Iranian officials in Tehran on October 26 to discuss ways to prevent renewed regional fighting.
Saudi Arabia said the visit was intended to open negotiating channels and prevent renewed military escalation.
The discussions took place as Washington and Tehran remained divided over terms for ending their confrontation, including sanctions, the US naval blockade of Iranian ports and the future of shipping through the Strait of Hormuz.
Turkish and Pakistani officials have maintained that the Mecca agreement is defensive and is not directed against Iran or any other country.
For Ankara, the immediate question remains how much practical military support it will provide Saudi Arabia. The defense agreement establishes a collective commitment, but the scope of any Turkish deployment and its role in the confrontation with the Houthis have yet to be determined.