Ongoing war with Russia remains the dominant barrier, as NATO membership would trigger Article 5 collective defense obligations amid active hostilities, a risk multiple allies explicitly reject. Recent statements from Secretary General Mark Rutte underscore that no membership promise exists and accession is not on the agenda, while key members including the United States, Germany, Hungary, and Slovakia withhold consensus. Former Ukrainian commander Valerii Zaluzhnyi highlighted structural mismatches in military standards and doctrines that would require years to resolve. With the 2026 deadline approaching, traders assign 98.3 percent probability to “No” based on absent invitations, stalled procedural steps, and emphasis on bilateral aid and peace negotiations instead. An unforeseen rapid ceasefire followed by unanimous allied agreement could theoretically alter the outcome before year-end, though current diplomatic and military conditions make such a shift improbable.