**The Mecca Joint Defence Agreement, signed on 7 August 2026 by Saudi Arabia, Türkiye, and Pakistan, establishes collective defence commitments and a permanent secretariat in Riyadh with a Pakistani secretary-general.** Turkish officials have publicly identified Egypt as a natural future member once technical and legal issues are resolved, while Bangladesh has expressed positive interest and Syria has confirmed it is reviewing options. Pakistan has noted expressions of interest from six or seven additional Muslim-majority states. The pact was activated on 5 October 2026 amid Houthi-related security threats to Saudi infrastructure, prompting commitments to rapid force deployment. These diplomatic signals, ongoing institutional development, and regional security pressures shape trader assessments of expansion timelines, with key catalysts including Egyptian deliberations and any upcoming ministerial or summit-level discussions.