The Japanese annexation of Korea was made effective on August 29, 1910, through a treaty that had been signed a week before, on August 22, between Lee Wan-Yong, Prime Minister of Korea, and Terauchi Masatake, Japanese Governor-General of Korea. Thus, Korea became part of the Japanese Empire, supplying Japan with valuable natural resources. The first step for this annexation had been the Japan-Korea Treaty of 1905, which was a political agreement by which Korea became a Japanese protectorate, losing its sovereignty as a nation. These two treaties were the result of the Japanese victory over the Russian Empire in the Russo-Japanese War. Russia was forced to withdraw its occupation troops from Korea and Japan became the only super-power of the Far East. It was possible thanks to a powerful navy equipped with modern and fast battleships. Thus, the power vacuum created by the Russian withdrawal from the Far East was immediately filled in by Japan as Korea fell under its direct political and cultural influence.