Traders assign an 89.5% probability that NATO will not invoke Article 5 before 2027 because no armed attack has struck alliance territory in a manner meeting the treaty’s threshold since the clause’s sole historical use after the 2001 terrorist attacks. Ongoing conflicts, including Russia’s war in non-NATO Ukraine and recent Middle East exchanges involving Iranian missiles near Turkey, have prompted Article 4 consultations but explicit statements from NATO officials ruling out collective-defense activation. Incidents such as Russian drones entering Polish airspace triggered enhanced vigilance measures rather than consensus on an armed attack. The alliance maintains strong deterrence through deployments and exercises, yet the requirement for unanimous agreement on qualifying events and each member’s sovereign response continues to set a high bar, keeping near-term invocation probabilities low amid stable patterns of hybrid threats and regional tensions.