Traders assign a 94.4% implied probability that NATO will not invoke Article 5 before 2027 because no armed attack on alliance territory has occurred or appears imminent in the short window remaining in 2026. Russia has issued warnings about targeting European arms factories supporting Ukraine and continues hybrid probes, sabotage, and rhetoric near the eastern flank, yet NATO maintains deliberate ambiguity around the collective-defense threshold to avoid giving adversaries clear escalation lines. Recent exercises, including Steadfast Noon nuclear drills, and statements from Secretary General Mark Rutte underscore deterrence without crossing into invocation conditions. Historical precedent shows Article 5 activated only once, after 9/11, with responses remaining consultative and calibrated rather than automatic, reinforcing the current trader consensus on low near-term risk.