|The Japanese completely defeated the Russian Navy in the Battle of the Straits of Tsushima. The Russian Baltic fleet, led by Admiral Rozhdestvenski, had been at sea for six months. It was defeated by a fleet led by Japanese Admiral Tojo. The Japanese sunk almost the entire Russian fleet. The magnitude of the Japanese victory led the Russians to agree to almost all Japanese demands made at the negotiating table. An agreement was reached in Portsmouth under the aegis of U.S. President Theodore Roosevelt. Under its terms, the Russians agreed to respect Japanese domination of the Korean peninsula. Both Russian and Japanese troops were withdrawn from Manchuria, but Russian rights to Port Arthur and Dalny were ceded to Japan. In addition, the southern part of the Sakhalin Islands were ceded to Japan.