Traders assign a 95.5% implied probability against a China-Japan military clash before 2027 due to persistent gray-zone maritime activity, including a tripling of Chinese research vessels in Japan's exclusive economic zone around the southwestern islands through September 2026, alongside routine coast guard patrols near the Senkaku Islands. These developments reflect continued diplomatic friction stemming from Japanese Prime Minister Sanae Takaichi's 2025 Taiwan remarks, yet both governments have contained incidents through coast guard responses and limited parliamentary outreach rather than kinetic escalation. Japan's defense buildup and alliances with the United States and regional partners further raise the threshold for direct confrontation. Realistic scenarios that could still shift odds include miscalculation during intensified patrols, a Taiwan contingency involving Japanese territory, or rapid escalation from live-fire exercises in disputed waters.