Political map of South & Southwest Asia 31 August 1907 (Anglo-Russian Entente): While the British were in Tibet (British expedition to Tibet), their ally Japan was fighting Russia in northeast Asia (Russo-Japanese War). To prevent this war spreading, Britain signed the Entente Cordiale with Russia's ally, France. Japan's victory the following year substantially reduced the Russian threat, encouraging Britain to first restore Tibet to China (Convention Between Great Britain and China Respecting Tibet) and then, in 1907, resolve the Anglo-Russian rivalry in Central Asia by agreeing to divide Persia into spheres of influence (Anglo-Russian Entente).