Siam (Thailand)
Because of the Fall of France to German opposition in 1940, access to overseas French colonies was weakened, and France could no longer hold substantial control over territory. As such, they were coerced to sign a peace treaty in Tokyo on May 9, 1941 that allowed the Japanese to set up military bases in Indochina, and also ceded several provinces from Laos and Cambodia to Siamese control. This is considered the first time Siam was able to triumph over a European superpower.
In October of 1946, these territories would be returned to French sovereignty once the French provisional government threatens to veto Siam's (Thailand's) proposed membership to the United Nations.
References
"Franco-Thai War" Wikipedia, Wikimedia Foundation, Web. 23 Oct. 2016.
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