Treaty of Kyakhta (1915)
The Treaty of Kyakhta (Mongolian: Хиагтын гэрээ; Russian: Кяхтинский договор; Chinese: 中俄蒙協約) was a tri-party treaty signed on 25 May 1915 among Russia, Mongolia, and China. Russia and China recognized Outer Mongolia's autonomy (as part of Chinese territory); Mongolia recognized China's suzerainty; Mongolia could not conclude international treaties with foreign countries regarding political and territorial questions.