European country agrees to give Ukraine security guarantee by June 30?

Analysis

Discarding Agent 1 (no research, 50% default), all 7 informed agents agree on the fundamental finding: no existing agreement meets the market's strict Article 5-equivalent standard, and all planned binding guarantees are conditional on a ceasefire that doesn't exist. The informed agent mean is ~14.9% with median ~12%. Agents 2 (7%), 3 (10%), 4 (12%), 5 (12%) had the strongest evidence with specific document analysis. Agents 6 and 7 at 22% appear to be hedging toward market price without stronger countervailing evidence. The 11.5 percentage point edge (21.5% market vs 10% estimate) is supported by highly specific, verifiable evidence: the exact text of declarations, expert analysis from Carnegie and DW, and the structural prerequisite of a ceasefire. The base rate in shared context is misleading as it counts cooperation agreements that explicitly don't meet resolution criteria. European countries have deliberately avoided Article 5-style commitments for 4 years due to escalation risks with Russia.

Key Evidence

All 28+ existing European-Ukraine security agreements explicitly avoid Article 5-style binding defense obligations. Binding guarantees under Paris Declaration are conditional on ceasefire, which doesn't exist and peace talks are stalled as of March 2026.

Risks

A surprise ceasefire breakthrough followed by rapid treaty formalization could change everything, but even then, formal ratification of binding defense treaties typically takes months to years.