European country agrees to give Ukraine security guarantee by...?

What you need to know

This market asks whether any European country will sign a hard, legally binding promise to militarily defend Ukraine — the kind of commitment where if Ukraine is attacked, that country is obligated to fight back. A Yes means at least one European nation crossed that line with a formal, finalized agreement. A No means no country went that far, even if many countries gave Ukraine weapons, money, or strong political support. The bar is very high: think of it like a full military alliance, not just a friendship pact. To resolve Yes, a European country and Ukraine must jointly announce a finalized written agreement — a treaty, MOU, joint declaration, or similar document — that explicitly commits the European country to respond militarily if Ukraine is attacked. Vague pledges, consultative frameworks, or support packages do not count. The US–Ukraine bilateral security agreement signed in 2024 is specifically cited as an example that would NOT qualify, because it stops short of a binding defense obligation. The deadline shown in the market title is December 31, 2026, though the criteria text also references June 30, 2026 — worth watching which date is treated as final. None of the provided news headlines are relevant to this market. There is no recent reporting about a European country moving toward a binding military defense commitment with Ukraine. If you are tracking this question, the kind of news that would matter is any announcement of formal treaty negotiations between a European government and Kyiv that explicitly use mutual-defense language. At 6%, the market is heavily priced toward No — so the main uncertainty is simply whether something unexpected happens, not a genuine coin-toss between two equal sides. The bar set by the criteria is extraordinarily high: no European country has ever made this kind of unilateral binding defense commitment outside of NATO. Doing so would be a historic and politically explosive step. The ongoing war, ceasefire discussions, and domestic politics in European countries all make such a commitment very difficult to formalize within the timeframe.

The odds right now

• December 31-5.5 pts (1w)6%

Price history

How this resolves

Resolves December 31, 2026

This market will resolve to “Yes” if any European country formally commits to giving Ukraine a security guarantee, defined as a publicly announced and mutually agreed deal between the relevant European country and the Government of Ukraine which creates a binding obligation for the relevant European country to defend or directly intervene on Ukraine’s behalf, by December 31, 2026, 11:59 PM ET. Otherwise, this market will resolve to “No.” A qualifying “security guarantee” requires language that is equivalent in character to a NATO Article 5–style mutual defense commitment: the relevant European country must commit to responding militarily if Ukraine is attacked, or otherwise guarantee Ukraine’s defense through binding defense obligations. Examples of qualifying language include commitments modeled on the US treaties with Japan, South Korea, or the Philippines, or NATO's Article 5 instrument, which obligates the United States to “act to meet the common danger” through military force if an ally is attacked. Cooperative frameworks, capacity-building measures, consultative mechanisms, or nonbinding pledges will not qualify. Examples of non-qualifying arrangements include the June 13, 2024 US–Ukraine bilateral security agreement, the Taiwan Relations Act, or G7/EU “security arrangements” that provide support or consultation but stop short of binding defense guarantees. A qualifying agreement must be jointly announced and finalized, and take the form of a treaty, executive agreement, memorandum of understanding, joint declaration, or equivalent written instrument. Announcements which are statements of intent, contingent, exploratory, or otherwise not indicative of a formalized policy will not count. The primary resolution source will be a consensus of credible reporting. Qualifying European countries include: Albania; Andorra; Armenia; Austria; Azerbaijan; Belgium; Bosnia and Herzegovina; Bulgaria; Croatia; Cyprus; Czechia; Denmark; Estonia; Finland; France; Georgia; Germany; Greece; Hungary; Iceland; Ireland; Italy; Latvia; Liechtenstein; Lithuania; Luxembourg; Malta; Moldova; Monaco; Montenegro; Netherlands; North Macedonia; Norway; Poland; Portugal; Romania; San Marino; Serbia; Slovakia; Slovenia; Spain; Sweden; Switzerland; Ukraine; United Kingdom.

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