Will Russia capture Kostyantynivka by December 31, 2026?

Russia's defense ministry announced full capture of Kostyantynivka, releasing imagery of troops with flags inside the city and describing it as one of Ukraine's main defensive hubs in the region — the substantive military question this contract asked is already answered. The resolution mechanism here ties strictly to a single mapping source shading the rail station icon to indicate Russian control, a lenient bar that counts as satisfied the moment that shading occurs even once, regardless of whether the area later changes hands again. Prior tracking had already documented Russian forces reaching the southern and southwestern districts around the station directly on their axis of advance, meaning the announced capture is consistent with, not contrary to, the trajectory analysts had been tracking for weeks. YES shares pay out once the mapping update reflects the announced capture, a formality rather than an open question. The live question now shifts to how much further Russian forces can extend gains along the broader Sloviansk-Kramatorsk axis before any ceasefire framework takes hold.