U.S. agrees to give Ukraine security guarantee by June 30?

Platform comparison

Market context

The United States is currently offering Ukraine a 15-year security guarantee as part of a revised peace plan, yet the market for a formal, binding commitment by June 30, 2026, sits at 0% probability. This stark divergence reflects the gap between a proposed assurance and the specific, NATO Article 5–style mutual defence obligation required for this contract to resolve "Yes". While President Zelenskyy has stated the deal is nearly 95% finalized, the current proposal remains conditional and vague, lacking the automatic intervention clause that defines a true security guarantee.

Historically, US security pledges to allies have often been ambiguous until codified in treaties, and the Trump administration’s current offer mirrors this pattern of "reliable" but conditional language rather than an unconditional defence pact. Analysts at the Brookings Institution note there is little reason to believe guarantees from this administration would be credible, suggesting vague pledges are worth less than the paper they are written on. The market correctly prices the risk that the current framework, which includes revoking the guarantee if Ukraine launches a missile at Moscow, falls short of the binding obligation required here.

Traders should monitor the finalisation of the peace framework, specifically whether the 20-point plan evolves into a legally binding treaty with explicit mutual defence language. Key catalysts include the upcoming trilateral negotiations and any official announcements confirming the US commitment to intervene directly if Russia invades again. Recent reports from the BBC indicate the US has set a June deadline for the war, but the absence of a confirmed Article 5–equivalent clause means the probability remains negligible until the text is formally ratified.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.