Recent reports from Yemeni officials indicate that Syria and Saudi Arabia reached a defense cooperation agreement during President Ahmed al-Sharaa’s Riyadh visit, with plans for an initial deployment of around 3,000 Syrian troops to support operations against Houthi forces, and hundreds of personnel already positioned along the Saudi-Yemeni border, including some directing drone activity from the Yemeni side. Syrian authorities have described broader troop deployments as premature, emphasizing domestic priorities and advisory or training roles under the new pact. The market’s low implied probability for Syrian regular forces entering Yemen by year-end reflects uncertainty over confirmation of combat entry versus limited support missions, amid ongoing Houthi strikes on Saudi targets and Riyadh’s push for additional allies. Resolution hinges on verifiable movements of officially affiliated Syrian armed forces into Yemeni territory before the deadline.