The Mecca Joint Defence Agreement, signed August 7, 2026, by Saudi Arabia, Türkiye, and Pakistan, establishes collective defense commitments modeled on mutual security principles and remains open to additional members. As of mid-October 2026, no further countries have formally acceded. Recent activation of joint measures in response to Houthi attacks on Saudi infrastructure has highlighted operational implementation without triggering new accessions. Egypt continues bilateral consultations amid reported technical and legal hurdles, while Qatar, Iran, Bangladesh, and Syria have received varying degrees of invitation or interest. Diplomatic momentum, parliamentary processes in candidate states, and any formal accession protocols announced before year-end will determine outcomes, with traders monitoring official statements from the founding members and potential joiners for resolution triggers.