Which cities will Russia enter by December 31?

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Market context

Russia is pursuing a methodical ground advance through eastern Ukraine’s Donbas region, aiming to encircle northern Donetsk and establish a buffer zone within artillery range of Kharkiv, the nation’s second-largest city[1]. The Institute for the Study of War (ISW) reports Russia captured roughly 4,700 square kilometres in 2025, with recent gains just north of Pokrovsk and east of Kostyantynivka[1]. Territory is deemed captured only when ISW’s map shades any part of a city under Russian control, a threshold that has been met for Toretsk, Chasiv Yar, and Plavni in 2025, but not yet for major urban centres like Kupyansk or Kharkiv itself[2].

Historical precedent suggests the 22% crowd-implied probability is conservative given Russia’s sustained offensive pressure and Ukraine’s fragmented reclamation efforts; Ukraine reclaimed only 0.8% of land in 2025 despite heavy losses, while drone strikes surged to over 29,000 incidents, overwhelming air defenses[3]. Comparable cases show that once Russian forces encircle a sector—such as their current push toward Kupyansk—urban capture often follows within months, though winter conditions and Ukrainian counter-strikes can delay progress. The persistence requirement for shading on ISW maps further filters out fleeting incursions, raising the bar for settlement.

Traders should monitor ISW’s daily Russian Offensive Campaign Assessments for confirmed shading changes around Kupyansk, Vovchansk, and the northern Donetsk corridor[4]. Key catalysts include Russia’s announced summer operations near Pokrovsk, Ukraine’s ability to hold defensive positions amid rising civilian casualties, and any shifts in drone or artillery intensity that could accelerate or stall the front line[1][6]. A sustained Russian advance toward Kharkiv’s outskirts by late 2026 would significantly increase the likelihood of city entry before the settlement window closes.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Football-specific comparison page for Which cities will Russia enter by December 31?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi (US-focused) or Manifold (play-money).

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