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

As of September 3, 2026, Polymarket prices “Will Russia capture all of Kostyantynivka by December 31, 2026?” at 20% YES with $955K traded. 2 tracked wallets hold a position here, 1 of them tier-1; the dominant side is NO.

Prediction markets put the probability at 40%: Will Russia capture all of Kostyantynivka by December 31, 2026. Currently, markets are divided (40% YES, 60% NO).

What’s Happening

As of early September 2026, Russian forces maintain a presence in approximately 72.23 percent of Kostyantynivka, yet have failed to complete the seizure of the city after more than ten months of urban combat, according to the Institute for the Study of War. The Kremlin’s claim on July 5, 2026 that Russian troops had already captured Kostyantynivka contradicts available evidence showing continued Ukrainian resistance inside the city limits. Russian military objectives regarding a potential "russia capture all of kostyantynivka" scenario remain central to Moscow’s broader campaign to seize the entire Slovyansk-Druzhkivka-Kramatorsk agglomeration, which Ukrainian officials describe as the Donbas fortress belt. Russian forces first infiltrated the city in October 2025, and subsequent frontal assaults have yielded only marginal tactical gains while failing to achieve a decisive breakthrough. [Institute for the Study of War, Sep 02]

The strategic importance of Kostyantynivka is underscored by Russian President Vladimir Putin’s reported order to the military to complete the seizure of all of Donetsk Oblast by December 31, 2026, a deadline that Ukrainian President Volodymyr Zelensky publicly highlighted on August 23, 2026. Western analysts note that Putin has repeatedly set unrealistic timelines, likely due to a misunderstanding of battlefield realities, and that the Russian military has struggled to conduct a wide envelopment of the Kostyantynivka-Druzhkivka area from its flanks. Ukrainian military observer Kostyantyn Mashovets reported on August 31, 2026 that Russian forces consolidated positions northeast of Kostyantynivka, entering Malynivka and advancing toward Vasyutynske, but these gains have not translated into control over the city’s core. The question of whether a "russia capture all of kostyantynivka" outcome is achievable by the end of 2026 hinges on whether Moscow can convert these incremental territorial advances into a complete operational victory. [Institute for the Study of War, Aug 24]

Russian forces gained approximately 123.53 square kilometers in August 2026, an average pace of 3.98 square kilometers per day, with the main territorial gains concentrated in the Fortress Belt area of Donetsk Oblast, according to the Institute for the Study of War’s September 1 assessment. Despite this tempo, Russian troops have failed to fully capture Kostyantynivka, and independent monitoring group DeepState acknowledged on July 1, 2026 that the enemy had successes in the area during the second half of June, while noting the pincer movement remained incomplete. The structural factor that will determine the resolution of this market is whether Russian forces can sustain their current advance rate while overcoming Ukrainian defensive positions in the city’s urban terrain, which has historically favored defenders. As of late August, Russian troops were attempting frontal assaults rather than successful wide envelopments, a tactical pattern that has produced high attrition without delivering the complete capture that Moscow seeks. [Institute for the Study of War, Sep 01]

Traded on Polymarket — $955K Volume