This market will resolve to “Yes” if, Ukraine signs any written instrument (e.g., treaty, ceasefire/armistice, framework/“roadmap,” exchange of letters, or mediated agreement text) that: (i) includes both Ukraine and the Russian Federation as parties, and (ii) either ends hostilities/establishes a ceasefire or commits both sides to a defined process toward ending the war (i.e., stated objective of peace/normalization plus principles, steps, and/or a timetable) by December 31, 2026, 11:59 PM ET. Otherwise, this market will resolve to “No”. Only Ukraine’s signature is required; Russia’s signature or ratification is not. Localized, temporary, or issue-specific arrangements—such as airstrike-limitation or deconfliction protocols, humanitarian pauses, evacuation corridors, prisoner-exchange or trade/export arrangements, border/DMZ adjustments, or ceasefires limited to a particular sector/front/municipality—will not qualify. The document must bear a wet-ink or officially issued electronic signature of an authorized Ukrainian representative. Unsigned agreements (e.g., the 2023 Ohrid arrangement) will not qualify regardless of if they are otherwise officially enacted. The primary resolution source will be a consensus of credible reporting.