NATO’s Article 5 collective-defense clause, requiring unanimous consensus among allies for an armed attack on one member to trigger obligations from all, has been invoked only once in its history. Current trader pricing at 91.5% against invocation before 2027 reflects the absence of qualifying armed attacks on alliance territory despite ongoing regional conflicts. Recent incidents, including Russian drone incursions into Poland and airspace violations near Estonia, prompted Article 4 consultations and enhanced eastern-flank patrols rather than collective-defense activation. The 2025 Hague Summit produced commitments to raise defense spending targets, bolstering deterrence without evidence of imminent escalation. Scheduled alliance exercises and diplomatic channels continue to address hybrid threats, while no official statements or verified developments indicate a near-term path to Article 5 activation.