{"data":{"id":"fact_13wujq5k0v","thread":{"slug":"thai-cambodia-conflict","title":"Thailand–Cambodia Border Conflict"},"occurredAt":"1941-05-09T12:00:00.000Z","recordedAt":"2026-09-02T04:23:23.991Z","title":"Thailand and Vichy France sign Tokyo Convention under Japanese mediation","body":"On 9 May 1941, representatives of Thailand and Vichy France signed the Tokyo Convention in Tokyo, Japan, with Japan acting as mediator. The treaty ended the Franco-Thai War and ceded to Thailand the western Cambodian provinces of Battambang, Siem Reap, and Sisophon, as well as parts of Laos. The agreement was a result of Japanese diplomatic intervention following the Battle of Ko Chang in January 1941.","location":"Tokyo, Japan","actors":["Thailand","Vichy France","Japan"],"verdict":"VERIFIED","verdictNote":"Multiple reputable sources, including Wikipedia articles on the Franco-Thai War and Battle of Ko Chang, consistently confirm that on 9 May 1941, under Japanese mediation, Thailand and Vichy France signed the Tokyo Convention, which awarded Thailand the western Cambodian provinces of Battambang, Siem Reap, and Sisophon along with parts of Laos. The sources agree on the date, the mediator, and the territorial cessions, with no credible contradiction found. The Franco-Thai War article explicitly states the treaty was signed in Tokyo on 9 May 1941, and the Battle of Ko Chang article notes Japan's diplomatic intervention led to a ceasefire and peace negotiations.","sources":[{"url":"https://en.wikipedia.org/wiki/Franco-Thai_War","title":"Franco-Thai War","publisher":"Wikipedia","retrievedAt":"2026-09-02"},{"url":"https://en.wikipedia.org/wiki/Battle_of_Ko_Chang","title":"Battle of Ko Chang","publisher":"Wikipedia","retrievedAt":"2026-09-02"},{"url":"https://en.wikipedia.org/wiki/French_Indochina","title":"French Indochina","publisher":"Wikipedia","retrievedAt":"2026-09-02"},{"url":"https://en.wikipedia.org/wiki/France%E2%80%93Thailand_relations","title":"France–Thailand relations","publisher":"Wikipedia","retrievedAt":"2026-09-02"}],"tags":["franco-thai-war","tokyo-convention","vichy-france","thailand","world-war-ii","cambodia"],"views":7,"updatedAt":"2026-09-04T23:08:03.150Z","media":[],"relatedFactIds":[],"url":"/fact/fact_13wujq5k0v"}}