92% — Will Russia capture Kostyantynivka by...
Leader: December 31, 2026 at 92% · Polymarket 92% · 3 contracts · $8K volume · medium confidence
Updated 2026-06-19 15:34:46 UTC

Tracks the leading outcome in a winner-take-all prediction market set with 3 outcomes.

Why this matters:
The 77% probability indicates traders believe Russia will capture Kostyantynivka by December 31, 2026, though the much lower prices for June and May deadlines (10-27%) suggest most gains would occur later in the year. The probability reflects Russia's recent territorial advances in the Donbas region, balanced against Ukrainian defensive capabilities and the logistics required to seize a city of Kostyantynivka's size and complexity. The main drivers are Russia's current pace of advance, availability of reinforcements, and Ukrainian ability to reinforce or counter-attack. The critical uncertainty centers on military momentum through mid-2026—any sustained Ukrainian counteroffensive or major shift in Western military aid would substantially shift expectations. Resolution depends on ground control verifiable by late December 2026, making seasonal conditions and battlefield developments over the next 7-8 months the key unknowns.

Key factors:
- Russia's current territorial control and proximity to Kostyantynivka, including distance from active front lines as of May 2026
- Ukrainian defensive capability and counteroffensive potential, measured by recent military operations and force composition in the sector
- The sharp probability drop from December 31 (77%) to June 30 (27%) indicates traders expect meaningful uncertainty rather than imminent capture
- Third-party military aid commitments to Ukraine and their delivery timeline, which directly affect defensive capacity
- Seasonal factors and attrition rates that historically affect ground operations in the region during late 2026

Contracts:
- Will Russia capture Kostyantynivka by...?: December 31, 2026 — 92¢ Polymarket $1K (weight 16%)
- Will Russia capture Kostyantynivka by...?: September 30, 2026 — 86¢ Polymarket $684 (weight 9%)
- Will Russia capture Kostyantynivka by...?: June 30, 2026 — 29¢ Polymarket $6K (weight 76%)

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## Methodology

SimpleFunctions aggregates live YES-side prices from Kalshi and Polymarket contracts bound to this question. For binary topics the headline is the liquidity-weighted mid-price (weight = log(1 + 24h volume) × freshness, where freshness is 1.0 if updated <24h, 0.7 if <7d, 0.4 otherwise). For multi-outcome (winner-take-all) topics the headline is the current leader's price — disjoint outcomes are never arithmetically averaged. Snapshots refresh every 5 minutes during market hours.

## SF Signal

- SF Index, regime, and 30d Brier calibration are computed separately and surfaced at https://simplefunctions.dev/admin/calibration.
- No SimpleFunctions index / regime / calibration signal is bound to this topic yet — the headline above is market-derived only.

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*Last verified: 2026-06-19T01:20:20.801Z*

By SimpleFunctions — https://simplefunctions.dev/

Cite as: "92% per prediction markets (SimpleFunctions, June 2026)"
Canonical: https://simplefunctions.dev/answer/russia-capture-kostyantynivka
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Provider: SimpleFunctions — https://simplefunctions.dev