Saudi Syria Defense Agreement: What Was Signed in Riyadh

Saudi Arabia and Syria have signed a cooperation agreement between their defence ministries, with Syrian President Ahmed al-Sharaa and Saudi Crown Prince Mohammed bin Salman overseeing the signing in Riyadh on November 4 during al-Sharaa’s second visit to the kingdom in under a month. The Saudi government announced the agreement the same day without publishing its terms, while Syria’s Foreign Ministry described it as the most notable outcome of the visit. Neither government has said whether the text covers training, arms transfers, intelligence sharing or the deployment of forces, leaving the agreement’s military weight undisclosed. The signing extends the rapprochement between Riyadh and the authorities that replaced Bashar al-Assad from reconstruction finance into defence. It comes as the kingdom seeks partners against a missile and drone campaign by Yemen’s Ansarullah movement, widely known as the Houthis, that has repeatedly reached its capital.

The defence agreement was one of several signed on November 4, alongside six agreements between the Saudi Fund for Development and Syria’s Finance Ministry for concessional loans worth more than $403 million, while memoranda covering industry, agriculture and environmental protection were also concluded. In statements issued after the talks, the two sides called for an immediate halt to actions threatening navigation in the Red Sea, the Bab al-Mandab strait and the Strait of Hormuz. The visit follows al-Sharaa’s meeting with the crown prince in Riyadh on October 6, after which U.S. officials said Damascus was weighing military support for the kingdom ranging from air defence assistance to ground forces in Yemen. Ahmad Zaidan, media adviser to al-Sharaa, called those reports lies, stating: “The security of the Kingdom of Saudi Arabia, and the security of the Gulf, is inseparable from the security of Syria.”

The more consequential question is whether Syria enters the Mecca Joint Defence Agreement, the treaty Saudi Arabia, Turkey and Pakistan signed in Mecca on August 7 under which an armed attack on one member is regarded as an attack on all three. Syrian Foreign Minister Asaad al-Shaibani said at the Manama Dialogue in Bahrain on October 31 that discussions were under way to assess Syria’s entry into the alliance, without giving a timeline. The pact was invoked for the first time on October 5 after Houthi strikes on the kingdom. Ankara and Islamabad have since pledged forces for the defence of Saudi territory while stating that the treaty will not take them into offensive operations in Yemen. A bilateral agreement followed by membership is the same sequence Saudi Arabia followed with Pakistan, whose Strategic Mutual Defence Agreement signed in Riyadh on September 17, 2025 became the core of the three-way pact eleven months later.

The agreement arrives as the Houthi campaign against the kingdom has widened, with the movement claiming on November 4 that a ballistic missile had directly hit King Khalid International Airport, a claim Saudi authorities have not confirmed, while its forces have pushed towards Aden. Syria’s own military is being rebuilt after the collapse of the Assad-era army in December 2024. The Defence Ministry under Murhaf Abu Qasra is still integrating former opposition factions into a single command, which considerably limits what Damascus could offer beyond manpower. A Syrian diplomat said in October that any request for military cooperation or the exchange of expertise would take place exclusively through official channels, and the agreement signed on November 4 now provides one.