Treaty of Portsmouth Treaty of Portsmouth The Treaty of Portsmouth formally ended the 1904–05 Russo-Japanese War. It was signed on September 5, 1905 after negotiations lasting from August 6 to August 30, at the Portsmouth Naval Shipyard in Kittery, Maine, United States. U.S. President Theodore Roosevelt was instrumental in the negotiations and won the Nobel Peace Prize for his efforts. The war of 1904–05 was fought between the Empire of Russia, an international power with one of the largest armies in the world, and the Empire of Japan, a nation which had only recently industrialized after two-and-a-half centuries of isolation. A series of
Treaty of Perpetual Peace (1686) the Crimean Khanate, which led to the Russo-Turkish War (1686–1700). The treaty was a major success for Russian diplomacy. Strongly opposed in Poland, it was not ratified by the Sejm (parliament of the Polish-Lithuanian Commonwealth) until 1710. The legal legitimacy of its ratification has been disputed. According to Jacek Staszewski, the treaty was not confirmed by a resolution of the Sejm until the Convocation Sejm (1764). It marked a turning point in Russo-Polish relations and played a big part in the struggle of Eastern European peoples against the Turkish-Tatar aggression. Subsequently, it facilitated Russia's struggle with Sweden for access to