Title: Japan–Russia relations
Content:  Japan–Russia relations (Российско-японские отношения, Rossiysko-yaponskiye otnosheniya; 日露関係史, Nichiro kankeishi) or Japanese–Russian relations refers to the bilateral international relations between Japan and the Russian Federation. Relations between Russia and Japan are the continuation of the relationship of Japan with the Soviet Union from 1917 to 1991, and with the Russian Empire from 1855 to 1917. Historically, the two countries had cordial relations until a clash of territorial ambitions in the Manchuria region of northeastern China led to the Russo–Japanese War in 1904, ending in a Japanese victory which contributed to the weakening of the monarchy in Russia. Japan would later intervene in the Russian Civil War from 1918 until 1922, sending troops to the Russian Far East and Siberia. That was followed by border 
Title: Russo-Japanese War
Content:  The Russo-Japanese War (Ру́сско-япóнская войнá; 日露戦争) was fought between the Empire of Japan and the Russian Empire during 1904 and 1905 over rival imperial ambitions in Manchuria and Korea. The major theatres of military operations were the Liaodong Peninsula and Mukden in Southern Manchuria, and the seas around Korea, Japan, and the Yellow Sea. Russia sought a warm-water port on the Pacific Ocean both for its navy and for maritime trade. Vladivostok remained ice-free and operational only during the summer; Port Arthur, a naval base in Liaodong Province leased to Russia by the Qing dynasty of China from 1897, was operational year round. Since the end of the First Sino-Japanese War in 
Title: Imperial Japanese Army
Content:   The Russo–Japanese War (1904–1905) was the result of tensions between Russia and Japan, grown largely out of rival imperialist ambitions toward Manchuria and Korea. The Japanese army inflicted severe losses against the Russians; however, they were not able to deal a decisive blow to the Russian armies. Over-reliance on infantry led to large casualties among Japanese forces, especially during the siege of Port Arthur.
Title: List of battles of the Russo-Japanese War
Content:   The following are known battles of the Russo-Japanese War, including all major engagements. The Russo-Japanese War lasted from 1904 until 1905. The conflict grew out of the rival imperialist ambitions of the Russian Empire and the Japanese Empire over Manchuria and Korea. The major theatres of operations were Southern Manchuria, specifically the area around the Liaodong Peninsula and Mukden, and the seas around Korea, Japan, and the Yellow Sea. The Russians were in constant pursuit of a warm-water port on the Pacific Ocean, for their navy as well as for maritime trade. The recently established Pacific seaport of Vladivostok was the only active Russian port that was reasonably operational during the summer season; but Port Arthur 
Title: Military history of the Russian Empire
Content:  See main article on Russo-Japanese War The war between Russia and the Japanese Empire broke out on February 8, 1904 with a Japanese attack upon the Russian Far East Fleet stationed at Port Arthur. Plagued with logistical problems, outdated military equipment and incompetent Russian officers, Russian forces suffered numerous defeats in the course of the war, which ended in September 1905, in the aftermath of the destruction of the Russian fleet at the Battle of Tsushima. Faced with growing internal problems, including the revolution of 1905, Russia sued for peace as the war concluded with the Treaty of Portsmouth.
Title: Empire of Japan
Content:   The Russo-Japanese War was a conflict for control of Korea and parts of Manchuria between the Russian Empire and Empire of Japan that took place from 1904 to 1905. The victory greatly raised Japan's stature in the world of global politics. The war is marked by the Japanese opposition of Russian interests in Korea, Manchuria, and China, notably, the Liaodong Peninsula, controlled by the city of Ryojun. Originally, in the Treaty of Shimonoseki, Ryojun had been given to Japan. This part of the treaty was overruled by Western powers, which gave the port to the Russian Empire, furthering Russian interests in the region. These interests came into conflict with Japanese interests. The war began with a surprise attack on the Russian Eastern fleet stationed at Port Arthur, which was followed by the Battle of Port Arthur. Those elements that attempted 
Title: Russian Far East
Content:  repression and of rallying patriotism in the aftermath of several general strikes. Japan issued a declaration of war on 8 February 1904. However, three hours before Japan's declaration of war was received by the Russian government, the Imperial Japanese Navy attacked the Russian 1st Pacific Squadron at Port Arthur. Eight days later Russia declared war on Japan. The war ended in September 1905 with a Japanese victory following the fall of Port Arthur and the failed Russian invasion of Japan through the Korean Peninsula and Northeast China; also, Japan had threatened to invade Primorsky Krai via Korea. The warring parties signed the 
Title: Japan–Soviet Union relations
Content:  The poor relations between the Soviet Union and Japan from the 1920s until the late 1940s originated in Japan's victory over imperial Russia, the predecessor state of the Soviet Union, in the Russo-Japanese War of 1904–05. During the Russian Civil War (1918–21), Japan (as a member of the Allied interventionist forces) occupied Vladivostok from 1918 until 1922, using as many as 70,000 troops. The Imperial Japanese Army also penetrated as far west as Lake Baikal and Buryatia, occupying the city of Chita in Transbaikal until October 1920. Japan formally recognized the Soviet Union in January 1925 with the Soviet–Japanese Basic Convention. They agreed that the 1905 Treaty of Portsmouth (the treaty between the Russian Empire and Imperial Japan which ended the Russo-Japanese War) remained in force, while other agreements and treaties between the two countries should be re-examined. By concluding this agreement, Japan formally recognized the Soviet Union. Ratifications were exchanged in Beijing on February 26, 1925. The agreement was registered in League of Nations Treaty Series on May 20, 1925.
Title: Japan–Russia relations
Content:  Relations between the Communist takeover in 1917 and the collapse of Communism in 1991 tended to be hostile. Japan had sent troops to counter the Bolshevik presence in Russia's Far East during the Russian Civil War, but left without any gains. Relations were tense in the 1930s, as Japan took full control of Manchuria in 1931 and made war on China in 1937. Moscow favored China. The Russians defeated Japan at the bloody Nomonhan Incident in 1939. Japanese leaders decided to avoid any war with the USSR and instead turned south against Britain, the Netherlands and the United States. The USSR declared war on Japan in August 1945 invaded Japanese-controlled areas 
Title: Foreign policy of the Russian Empire
Content:  The Russo-Japanese War (1904–1905) was fought over rival ambitions in Manchuria and Korea. Most international observers expected Russia to win easily over upstart Japan—and were astonished when Japan sank the main Russian fleet and won the war, marking the first great Asian victory over a modern European power. Russia sought a warm-water port on the Pacific Ocean for its growing navy, and to expand maritime trade. Vladivostok was operational only during the summer, whereas Port Arthur, a naval base in Liaodong Province leased to Russia by China, was operational all year. Since the end of the First Sino-Japanese War in 1895, negotiations between Russia and Japan went nowhere. Japan was worried by Russia's long march 

Question: where did the russian japanese war happen?
Answer: Yellow Sea.