Will Russia capture all of Kostyantynivka by December 31, 2026?

Prediction markets put the probability at 36%: Will Russia capture all of Kostyantynivka by December 31, 2026. Currently, markets are divided (36% YES, 64% NO). Russia’s military offensive accelerated in late May and early June after months of stagnation and Ukrainian counterattacks.

What’s Happening

In early June 2026, Russian forces accelerated their offensive in eastern Ukraine, making significant gains near the city of Kostyantynivka at the southern end of the greater Kramatorsk area. According to reports from Meduza on June 6, 2026, Ukraine’s defenses in Kostyantynivka weakened sharply in recent weeks, allowing Russian troops to push toward the city center from two directions. This development has intensified debate over whether Russia capture all of Kostyantynivka is a realistic outcome by the end of the year, with the current probability standing at 36% YES and 64% NO. The advance comes after months of stagnation and Ukrainian counterattacks, and Russian forces are also pressing east of Sloviansk and Kramatorsk along the Siverskyi Donets River and the Donbas Canal. [Meduza, Jun 6]

However, the broader battlefield picture suggests Ukraine is regaining the initiative. The Institute for the Study of War reported on June 5, 2026 that Ukrainian forces liberated more territory than Russian forces seized in April and May 2026, highlighting Russia’s dwindling battlefield performance. Ukrainian monitoring group DeepState confirmed on June 1, 2026 that Russia occupied only 14 square kilometers of Ukrainian territory in May, pushing net Russian gains into negative territory for the first time since 2023. This counteroffensive momentum, combined with Ukraine’s growing mid-range strike campaign, has hindered Russian logistics and troop concentrations, making the goal of Russia capture all of Kostyantynivka increasingly difficult to achieve within the current timeframe. [Institute for the Study of War, Jun 5]

The political and strategic context further complicates Russia’s prospects. On June 4, 2026, President Vladimir Putin rejected Ukrainian President Volodymyr Zelenskyy’s offer for direct talks, while Ukraine intensified long-range strikes inside Russian territory, including a drone attack on the port of St. Petersburg on June 3, 2026. Ukrainian intelligence chief Kyrylo Budanov stated on June 1, 2026 that ending the war before winter 2026 is a realistic goal, as Moscow loses the initiative. The structural factor that will determine whether Russia capture all of Kostyantynivka by December 31, 2026, is the sustainability of Ukraine’s counteroffensive and its ability to maintain pressure on Russian supply lines, while Russia faces mounting attrition and logistical constraints. [Kyiv Independent, Jun 1]

Traded on Polymarket — $191K Volume

Polymarket prices this at 46c YES with $191K in volume. Moderate liquidity — use limit orders for positions above $1K to avoid moving the price.