Will Russia capture Kostyantynivka by May 31?

Prediction markets put the probability at 5%: Will Russia capture Kostyantynivka by May 31. Currently, markets see this as unlikely (5% YES). Russia is losing in Ukraine.

What’s Happening

Western intelligence assessments published in late May indicate that Russian forces have failed to achieve the breakthrough in Donetsk Oblast that the Kremlin set as its 2026 objective. The US Defense Intelligence Agency noted on May 18 that Ukraine has registered recent territorial gains following Russian forces' loss of access to Starlink in early February 2026. The Institute for the Study of War assessed on May 22 that Ukrainian forces are hindering Russian advances across multiple sectors of the front, even as the Kremlin remains committed to its original war aims. The question of whether Russia capture Kostyantynivka by May 31 sits within this broader pattern of stalled offensive operations along the Donetsk axis. [ISW, May 22]

Hawkish Russian milbloggers had projected throughout early 2026 that Kostyantynivka — a fortress city anchoring the southern Donetsk defensive belt alongside Kramatorsk and Sloviansk — would fall by summer, citing Russia's advantages in artillery mass and manpower. Analysts at CNN and ISW caution that those projections have not materialized. Ukrainian forces recaptured significant ground around Kupyansk starting in November 2025 and liberated over 400 square kilometers in southern Ukraine during the winter, marking the most significant battlefield gains since the August 2024 Kursk incursion. President Vladimir Putin's hopes that 2026 would deliver seized contested lands in eastern Ukraine have been undermined by these counterattacks, according to CNN's May 20 analysis. [CNN, May 20]

The structural factor determining whether Russia capture Kostyantynivka by May 31 is the pace of urban assault operations, which historically measure in months rather than days for fortified Ukrainian cities of this size. Russia has adapted tactically — Forbes reported on May 23 that Russian units are now capturing, repairing and redeploying Ukrainian "Baba Yaga" heavy bomber drones to offset their own drone shortfalls. With only days remaining in the resolution window and no reported Russian forces inside Kostyantynivka's urban perimeter, the operational tempo required for a May 31 capture is not present in current ISW frontline mapping. The Kremlin's commitment to its maximalist war aims, per the DIA assessment, suggests sustained pressure beyond the resolution date rather than imminent collapse of the city's defenses. [Forbes, May 23]

Traded on Polymarket — $57K Volume

Lower-volume market on Polymarket ($57K). Wider spreads expected — enter with limit orders and be aware of slippage risk. Currently 5c YES.