NATO allies have maintained unified deterrence and avoided direct armed attacks on member territory through 2026, keeping the probability of Article 5 invocation low. Russia’s ongoing operations in Ukraine have produced hybrid incidents such as drone incursions over Poland and Romania, yet these have prompted Article 4 consultations rather than collective defense measures. The July 2026 Ankara summit produced a formal reaffirmation of the “attack on one is an attack on all” commitment alongside pledges of continued Ukraine support, while European spending increases and U.S. warnings to Moscow have reinforced existing red lines. No member has faced the unambiguous conventional or large-scale assault required to trigger the clause, and traders view the remaining months before 2027 as insufficient for escalation beyond current patterns of calibrated pressure.