The Strategic Mutual Defence Agreement (SMDA) is a formal security and defence pact between Pakistan and Saudi Arabia, signed on September 17, 2025, in Riyadh. The agreement is a culmination of a decades-long security partnership, which was first anchored in the 1951 Treaty of Friendship and a subsequent defense protocol in 1967. The pact was created to formalize and deepen this alliance amid heightened regional instability, particularly following the Israeli strikes on Qatar on September 9, 2025, and growing doubts about the reliability of the United States as a security guarantor.
The central mechanism of the SMDA is the principle of collective security, which stipulates that "any aggression against either country shall be considered an aggression against both." This key provision is explicitly inspired by Article 5 of the North Atlantic Treaty (NATO). The agreement aims to strengthen joint deterrence, deepen military cooperation, and share strategic intelligence, facilitating cooperation in areas like training, joint operations, and defense coordination.
The SMDA connects to the concept of a "nuclear umbrella," as Pakistan's Defence Minister Khawaja Asif stated that Saudi Arabia would benefit from Pakistan's nuclear capabilities under the pact. The agreement itself is the most significant recent change, as it formally upgraded the existing security relationship, which previously involved the deployment of Pakistani troops to Saudi Arabia for training and defense. While the core principle of mutual aggression was reiterated from previous agreements, the 2025 pact institutionalized this commitment, marking a major strategic shift for both nations.