British negotiators at the Simla Convention heard about the treaty and got very suspicious. They feared that Russia might use the treaty to gain more influence in Tibet. In the end, China did not sign the Simla Convention. Instead, a very similar treaty was signed by Mongolia, China, and Russia on 25 May 1915. This treaty was called the tripartite Treaty of Kyakhta. The agreement stated that Mongolia was completely autonomous in internal matters and that Russia had certain privileges in Mongolia. At the same time it said that Mongolia was in fact a part of China.