Which country was a buffer state in Southeast Asia between the British and French Empires?

Question

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Thailand (formerly known as Siam) was the only Southeast Asian country that was not colonized by European powers. It served as a buffer state between the British Empire, which controlled Burma and Malaysia, and the French Empire, which controlled Indochina (including Vietnam). This unique position allowed Thailand to maintain its sovereignty during the colonial period by skillfully navigating between these two major powers.

Which Country Was a Buffer State in Southeast Asia Between