From the ACX 2025 Prediction Contest:

Will resolve according to the Metaculus resolution:

This question will resolve as Yes if a bilateral ceasefire has gone into effect and stood for 30 days, beginning at any point between January 1, 2025 to December 31, 2025, inclusive. A ceasefire is bilateral if it applies to the majorities of combatants on both the Russian and Ukrainian sides, respectively. A ceasefire is deemed to have stood as long as no reliable sources report that the ceasefire has broken down or is no longer effective. If no ceasefire has stood for 30 days before January 30, 2026, this question will resolve as No.

The ceasefire must apply to all military operations in all official and disputed Ukrainian and Russian territory. In other words, a limited ceasefire (such as granting safety to humanitarian corridors or specific regions) is insufficient to resolve the question as Yes.