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

- [2026-10-16] ISW's key takeaways say Ukrainian forces advanced in the Kostyantynivka–Druzhkivka tactical area. ISW also says Russia is facing battlefield setbacks. https://www.kyivpost.com/post/87331 - [2026-10-09] ISW says Russian forces continued attacks in the Kostyantynivka direction on Oct 8–9 but did not advance. https://www.criticalthreats.org/analysis/russian-offensive-campaign-assessment-october-9-2026 - [2026-10-09] The Russian MoD repeated its claim to have seized Kostyantynivka. ISW says Russia has not seized the city and has not consolidated many of the positions it infiltrated. https://www.criticalthreats.org/analysis/russian-offensive-campaign-assessment-october-9-2026 - [2026-10-09] ISW assessed that Russia had advanced within less than 40% of the city as of early October. A Russian milblogger conceded that Ukraine holds the northern part of Dovha Balka, southwest of the city. https://www.criticalthreats.org/analysis/russian-offensive-campaign-assessment-october-9-2026 - [2026-10-06] ISW reported Ukrainian counterattacks widening in the Kostyantynivka direction, including reported ones toward Rusyn Yar. https://www.criticalthreats.org/analysis/russian-offensive-campaign-assessment-october-6-2026 - [2026-09-13] DeepState recorded new Russian advances near two villages in the Kostyantynivka direction. https://www.unian.ua/war/kostyantinivskiy-napryamok-u-deepstate-zayavili-pro-novi-prosuvannya-rosiyan-13498383.html - [2026-08-26] DeepState described Russia trying to enlarge a "pocket" around the city while infiltrating it. https://nationalnews.com.ua/post/voroh-namahayetsya-zakhopyty-kostyantynivku-rozshyryuyuchy-mishok-navkolo-mista-deepstate - [2026-08-08] DeepState marked more than half of the city as a "grey zone". https://glavcom.ua/country/incidents/okupanti-zakhopili-novi-pozitsiji-pid-kostjantinivkoju-deepstate-1135709.html - [2026-07-20] Syrskyi said up to 145 Russian troops remained in the city. Ukraine's 425th regiment said on July 18 that it had cleared the central part. https://english.nv.ua/tags/kostiantynivka.html - [2026-07-03/11] Russia's MoD first claimed capture of the city on about July 3. Ukraine denied it, and the Washington Times found the evidence did not show full Russian control. https://www.washingtontimes.com/news/2026/jul/11/russia-says-kostiantynivka-fallen-ukrainian-troops-inside-city-tell/ - [2026-10-17] No negotiated settlement is in place. Zelensky says Putin doesn't want talks "in any format". The Kyiv Post's listing shows a US–Russia diesel sanctions waiver dated Oct 9, and no ceasefire. https://www.kyivpost.com/post/87331 - [2026-10-17] The Battle of Kostiantynivka page lists the battle as ongoing, with no capture. https://en.wikipedia.org/wiki/Battle_of_Kostiantynivka BOTTOM LINE: As of Oct 17, ISW does not show Kostyantynivka as Russian-controlled. ISW puts Russian advances at under 40% of the city, with Russian infiltration areas not counting toward resolution. Momentum has recently moved toward Ukraine, so a full ISW-shaded capture by Dec 31 would need a sharp reversal. NOT FOUND: A direct view of the live ISW ArcGIS map layers; the interactive map is a JavaScript app and I did not open it. The text of ISW's "Ukraine disrupts Russia's Donetsk offensive" report. DeepState's current percentage figures for October. Any scheduled event before Dec 31 that would change control, such as a ceasefire or talks.

- [2026-10-09] ISW said Russian forces attacked in the Kostyantynivka direction on Oct 8–9 and did not advance. It assessed that Russia has not seized the city and has not consolidated many of its infiltrated positions. ISW also saw evidence that Russia had advanced within less than 40% of the city as of early October. A Russian milblogger conceded that Ukraine holds the northern part of Dovha Balka, southwest of the city. https://www.criticalthreats.org/analysis/russian-offensive-campaign-assessment-october-9-2026 - [2026-10-16] ISW's Oct 16 update says Ukrainian forces advanced in the Kostyantynivka-Druzhkivka tactical area. That is a Ukrainian gain, not a Russian one. The same update says Russia is facing battlefield setbacks. https://www.kyivpost.com/post/87331 - [2026-07-03] Russia's Defence Ministry and Gerasimov claimed the capture of Kostiantynivka, and Putin praised it. Ukraine denied it. The claim is not ISW-qualifying. ISW calls it false, and Russia's earlier claims were ahead of the ground reality. https://www.usnews.com/news/world/articles/2026-07-03/russian-defence-ministry-says-its-forces-captured-kostiantynivka-in-eastern-ukraine - [2026-07] The UK MoD assessed it "highly unlikely" that Russia had fully secured the city. It judged that Russia likely held a bit over half the urban centre. The National Interest noted that Russia took Bakhmut only after months of premature claims. The UK figure is well above ISW's under-40% figure. https://nationalinterest.org/blog/buzz/russia-just-claimed-captured-another-city-eastern-ukraine-sa-071526 - [2026-07-16] CNN described a slow, costly infiltration lasting over a year and called Putin's claim false. It reported that a week after the claim, Ukrainian drones were still hitting Russian troops in the rubble. https://www.cnn.com/2026/07/16/europe/russia-ukraine-kostyantynivka-capture-claim-intl - [2026-07-29] DeepState reported that Russia was still making constant infiltration attempts and trying to consolidate positions. Its stated key objective was the Illinivka–Novodmytrivka section. The city stayed under Ukrainian control. https://www.pravda.com.ua/eng/news/2026/07/29/8046342/ - [2026-06-16] DeepState called the situation the "worst-case scenario" and compared it to Pokrovsk's gradual absorption. This is a Ukrainian-source pessimistic view, from before the stall seen since July. https://www.pravda.com.ua/eng/news/2026/06/16/8039670/ - [2026-02-25] Reference class, Pokrovsk: Russia's offensive began in Feb 2024. It took 21 months to seize the bulk of the city by Dec 2025, and about 1–2 more months to finish. ISW judged the city fell only in early Feb 2026, based on a lack of evidence of Ukrainian activity. Myrnohrad took about another month. https://english.nv.ua/russian-war/pokrovsk-falls-to-russia-but-kremlin-fails-to-exploit-its-capture-50587178.html - [2025-12-11 / 2025-12-28] Reference class, ISW's "half" milestones: ISW assessed Russia active in about 49% of Myrnohrad around Dec 27. The town was fully taken about a month later. Huliaipole was also about half held then. Kostyantynivka, at under 40% in October after about 12 months of fighting since Oct 2025, is behind that milestone. https://english.nv.ua/russian-war/isw-russia-controls-half-of-myrnohrad-huliaipole-ukraine-holds-ground-in-rodynske-50571894.html - [2026 overview] The Battle of Kostiantynivka started in Oct 2025 and is still marked "ongoing". Russia began assaulting the southwest from Yablunivka in early 2026. https://en.wikipedia.org/wiki/Battle_of_Kostiantynivka - [2026-04/2026-02] Momentum context: ISW assessed a net Russian territorial loss of 116 km² in April 2026, the first since the Kursk incursion. It said the rate of advance had fallen since Nov 2025. Ukraine also ran a counteroffensive in the south in Feb 2026. https://euromaidanpress.com/2025/12/11/isw-pokrovsk-not-captured-but-fighting-remains-severe/ - [2026-10-09] Diplomacy context: ISW sees no Russian concessions in the US-led negotiations. Zelensky says Putin wants no talks. A negotiated handover of the city by Dec 31 therefore looks very unlikely. https://www.criticalthreats.org/analysis/russian-offensive-campaign-assessment-october-9-2026 BOTTOM LINE: The outside view is unfavourable for a "Yes". In the closest comparable cases (Pokrovsk, Myrnohrad), ISW's "about half" milestone came about a month before completion. Kostyantynivka is under 40% by ISW after a year, Russian momentum has stalled, and Ukraine has recently advanced there. Finishing the whole municipality in the 2.5 months left, with ISW shading persisting, would need an abrupt acceleration or collapse of the Ukrainian defence. NOT FOUND: Prediction-market, expert or poll forecasts for Kostyantynivka's fall date. I also did not read the current ISW or DeepState map shading directly. The text of the ISW report "Ukraine disrupts Russia's Donetsk offensive" was not fetched.

YES means: Russia captures all of Kostyantynivka by 11:59 PM ET on 2026-12-31, with the ISW map showing the whole municipality under "Assessed Russian-Controlled Terrain" or "Assessed Russian Advances" (or Russia gains actual control through a settlement). Shading must persist through the next full ISW update. - [2026-10-15] ISW's Oct 14–15 reports say Russian forces kept up offensive operations in and near Kostyantynivka but made no confirmed advances. The same report says Ukraine's Operation Vivaldi collapsed the Russian salient north of Lyman. This is the case against Yes; the strongest case for Yes has to survive it. Source: https://www.criticalthreats.org/analysis/russian-offensive-campaign-assessment-october-15-2026 - [2026-10-15] Yes-case mechanism, ISW's assessment of how Russia misjudges the front: ISW says a "culture of lying" in the Russian military leaves commanders with an unrealistic picture of the front line. That raises the odds that Moscow keeps committing infantry in the same infiltration pattern, but it does not show Russia is gaining ground. Source: https://www.criticalthreats.org/analysis/russian-offensive-campaign-assessment-october-15-2026 - [2026-10-15] Diplomacy: Lavrov said "there will be no ceasefire". This closes the negotiated-handover path to Yes. The only route is a military capture shown on the ISW map. Source: https://www.criticalthreats.org/analysis/russian-offensive-campaign-assessment-october-15-2026 - [2026-07-31] Al Jazeera put the ISW figure at 37% of the city three weeks earlier (about July 10), then said ISW's latest assessment showed infiltration had spread to most of the city. Infiltration is not shaded as control, but the footprint was large. Ukrainian soldiers told Hromadske the city was "effectively already lost". A local commander said units could be surrounded in "another month or two". Source: https://www.aljazeera.com/features/2026/7/31/russia-appears-to-infiltrate-first-fortress-city-as-ukraine-changes-guard - [2026-07-31] Russian combat strength rose after the summer lull. Ukraine's drone-force commander Brovdi said Russian personnel in offensive operations were up 12% on June and 18% on May. That points to higher Russian capacity to commit infantry. Source: https://www.aljazeera.com/features/2026/7/31/russia-appears-to-infiltrate-first-fortress-city-as-ukraine-changes-guard - [2026-07-31] Ukrainian command turmoil: both the defence minister (Fedorov) and the commander-in-chief (Syrskyi) were dismissed within a week. This is a possible weakness in the defence, but Ukraine reinforced the sector afterwards (see Sept 17). Source: https://www.aljazeera.com/features/2026/7/31/russia-appears-to-infiltrate-first-fortress-city-as-ukraine-changes-guard - [2026-09-10] DeepState logged Russian advances near Kostyantynivka and Chervone. UNIAN, in a later piece, says DeepState marks the city as an infiltration area. The Russian pocket is still growing slowly, but nothing is marked as controlled. Sources: https://censor.net/ua/news/4022711/rf-prosunulasya-bilya-kostyantynivky-ta-chervonogo-deepstate ; https://www.unian.ua/war/zagarbniki-prosunulisya-bilya-konstyantinivki-deepstate-rozkriv-detali-13495431.html - [2026-08-late] Ukrainian analyst Kovalenko expected Russia to take Kostyantynivka and Chasiv Yar by end-2026. This is one analyst's opinion, not an ISW view, and it predates the Oct stall. Source: https://www.unian.ua/war/zagarbniki-prosunulisya-bilya-konstyantinivki-deepstate-rozkriv-detali-13495431.html - [2026-07-29] DeepState said Russia's main aim was to take the Illinivka–Novodmytrivka section, which could threaten encirclement of the Chasiv Yar grouping. If that works, the city's northern exit could be cut and the garrison could collapse quickly, as at Pokrovsk. Source: https://www.pravda.com.ua/eng/news/2026/07/29/8046342/ - [2026-09-17] The Ukrainian side said the northern pincer had been broken and Russia's ring "will not close". Euromaidan Press: Russia has taken none of the four fortress cities. Ukraine put two new Azov-led groupings into the sector. This limits the Yes path. Source: https://euromaidanpress.com/2026/09/17/one-pincer-stalled-a-year-ago-the-other-has-just-been-broken-near-kostiantynivka-russias-ring-will-not-close-ukrainian-commander-says/ Single most likely path to Yes: the infiltration pattern seen at Pokrovsk. ISW's "less than 40%" figure (Oct 9) grows quickly as Russia consolidates Illinivka–Novodmytrivka and Dovha Balka. The northern exit toward Druzhkivka is cut, the garrison withdraws or collapses, and ISW then shades the whole city. Prerequisites: 1. Russia reverses the Oct 6–16 Ukrainian counterattacks around Dovha Balka and Rusyn Yar. 2. ISW starts counting infiltrated areas as advances or control. 3. All of this finishes, with shading persisting, within about 10 weeks. BOTTOM LINE: The strongest Yes case rests on Russian infiltration having spread widely since July, rising Russian troop numbers, Ukrainian command turnover, and the Pokrovsk pattern of fast collapse once the defence breaks. All of it is weakened by the October lack of Russian advances and by ISW's under-40% figure, and no ceasefire handover is plausible. NOT FOUND: The live ISW ArcGIS shading for Kostyantynivka. A current DeepState percentage for October. The text of ISW's Oct 16 report. Any Russian-side evidence of a breakthrough after Oct 9.

YES means: According to the ISW map, the entire municipality of Kostyantynivka is shaded as Assessed Russian-Controlled Terrain or Assessed Russian Advances by 11:59 PM ET on 2026-12-31. The shading must persist through the next full ISW update cycle. Alternatively, Russia gains actual control through a negotiated settlement. Infiltration-area shading and Claimed Russian Territory do not count. - [2026-10-15] ISW reports Russian forces "did not advance" near and in Kostyantynivka on Oct 14–15. The same report says Operation Vivaldi collapsed the Russian salient north of Lyman and disrupted Russia's plan to encircle the Fortress Belt. That plan was the flanking route meant to isolate the Kostyantynivka–Druzhkivka area. The report also says Russian command's habit of lying has left it with an unrealistic picture of the front line. With the flank threat gone, Russia would have to clear the city street by street. https://www.criticalthreats.org/analysis/russian-offensive-campaign-assessment-october-15-2026 - [2026-10-13] The Polish think tank OSW (a non-ISW source) describes a "vast grey zone" in north-western Kostyantynivka, with fierce fighting still under way. The grey zone would have to be cleared and then shaded Russian-controlled, not merely infiltrated. OSW also says Ukraine is working to stop Druzhkivka being encircled from the west. https://www.osw.waw.pl/en/publikacje/analyses/2026-10-13/a-unilateral-energy-truce-day-1693-war - [2026-10-13] ISW recorded no Russian advances at Kostyantynivka on Oct 12–13, with attacks inside the city, west of it and southwest of Druzhkivka. Combined with Oct 8–9 and Oct 14–15, that is at least three consecutive reporting windows without a recorded gain. https://united24media.com/war-in-ukraine/ukraine-gains-ground-near-sumy-as-russian-offensives-fail-to-break-through-elsewhere-23425 - [2026-10-09] Ukraine's General Staff logged 15 combat engagements in the Kostyantynivka sector in a day. Ukrainian forces are therefore still defending actively in the city, not withdrawing. https://ua.news/en/war-vs-rf/ponad-30-atak-na-pokrovskomu-ta-kostiantinivskomu-napriamkakh-vidbili-zsu - [2026-07-31] Al Jazeera, citing ISW, says Russian presence was about 37% of the city in mid-July, mostly infiltration. ISW's early-October figure is under 40%. Almost three months passed with essentially no net increase in ISW's measure. Reaching 100% by Dec 31 would need a much faster pace than any recorded since. https://www.aljazeera.com/features/2026/7/31/russia-appears-to-infiltrate-first-fortress-city-as-ukraine-changes-guard - [2026-07-04] Ukraine's General Staff says Russian incursions are small groups of one to three troops that are being found and killed. Infiltrators of that size are what ISW shades as infiltration, not control. https://newsukraine.rbc.ua/news/ukraine-says-kostiantynivka-remains-under-1783153978.html - [Resolution mechanics] Several features make "Yes" hard to reach. The whole municipality must be shaded, so any single Ukrainian-held pocket means "No". ISW has already called Russia's capture claim false, and ISW needs positive evidence of Ukrainian absence. ISW also requires persistence through one more daily cycle, so a late-December gain could be too late. That is inference from the criteria, not a quoted rule. - [2026-10-15] Lavrov said "there will be no ceasefire". The Kremlin disowns the Oct 11–14 energy-strike pause, so a negotiated handover that gives Russia actual control of the city before Dec 31 is not in prospect. https://www.criticalthreats.org/analysis/russian-offensive-campaign-assessment-october-15-2026 - [2026-10-16] ISW's weekly framing says the Russian military is facing setbacks and mounting casualties. This is ISW's own analytic view of the trend. https://www.kyivpost.com/post/87331 BOTTOM LINE: The status quo points to "No". ISW shows Russia under 40% of the city, mostly infiltration that does not count. Russian gains have been flat for about three months, and the Fortress Belt flanking plan has been disrupted. Completing the whole municipality with persistent ISW shading in 75 days would be an extreme acceleration. NOT FOUND: The live ISW ArcGIS layer shading for Kostyantynivka. DeepState's current October percentage for the city. A prediction-market or expert forecast of a fall date. Any scheduled event that would change control before Dec 31.