Will Russia capture Kostyantynivka by December 31, 2026?

Prediction markets put the probability at 90%: Will Russia capture Kostyantynivka by December 31, 2026. Currently, markets see this as likely (90% YES). What to know: Latest from the Institute for the Study of War.

What’s Happening

The Institute for the Study of War reported on June 12, 2026 that Russian sources released footage purporting to show Russian forces operating inside Kostyantynivka as part of what ISW described as a deliberate cognitive warfare effort to exaggerate the pace of Russian advances. President Vladimir Putin used the Russia Day holiday on June 12 to posture military strength while acknowledging recent battlefield setbacks, a rare admission from the Kremlin as the offensive on the Donetsk Oblast stronghold enters its fifth consecutive month of intensified pressure. The question of whether Russia capture Kostyantynivka before year-end has become a central indicator of the broader Donbas campaign's trajectory, with ISW analysts emphasizing that footage circulation does not equate to consolidated territorial control. [Kyiv Post, Jun 13]

Hawkish assessments point to the sustained operational tempo around the city, with Russian forces concentrating four full field armies across the Southern Military District according to June 2026 order-of-battle data. Conversely, analyst Mick Ryan argued on June 8 that Russia is "losing in every dimension" of the conflict — military, cognitive, moral, industrial, and economic — entering the fifth year since the full-scale invasion. The Kyiv Independent noted the geopolitical backdrop shifted at the May 2026 Trump-Xi summit in Beijing, where Chinese President Xi Jinping reportedly told his American counterpart that Putin "might end up regretting" the invasion, signaling potential erosion of Beijing's backing that has sustained Moscow's war economy. [Kyiv Independent, Jun 11]

The structural factor determining whether Russia capture Kostyantynivka by December 31, 2026 remains the integrity of Russian logistics. DW reported on June 10 that Ukrainian forces are launching concentrated strikes on the land corridor to Crimea, Moscow's most strategically significant territorial gain since 2022, with the Chongar and Armyansk crossings on the Perekop Isthmus emerging as priority interdiction targets. Whether Russia capture Kostyantynivka depends on whether Moscow can sustain artillery and personnel throughput into Donetsk Oblast while simultaneously defending southern supply lines under accelerating Ukrainian deep-strike pressure across the remaining six months of 2026. [DW, Jun 10]

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