Russo-Japanese War

The Russo-Japanese War was fought between the Russian Empire and the Empire of Japan from 8 February 1904 to 5 September 1905, driven by clashing imperial goals in Manchuria and Korea. The main land fighting took place on the Liaodong Peninsula and near Mukden in southern Manchuria, while naval engagements occurred in the Yellow Sea and the Sea of Japan.

The conflict’s roots lay in the aftermath of the First Sino-Japanese War. The 1895 Treaty of Shimonoseki gave Japan the Liaodong Peninsula and Port Arthur, but Russia, Germany, and France forced Japan to give them back in the Triple Intervention. Japan grew worried that Russia would block its plans for a mainland Asian sphere of influence, especially as Russia built the Trans-Siberian Railroad, expanded into Korea, and secured a lease on the Liaodong Peninsula and Port Arthur from China in 1898. Japan formed the Anglo-Japanese Alliance in 1902 and proposed recognizing Russian control in Manchuria in exchange for Russian recognition of Korea as part of Japan’s sphere, but Russia refused.

After talks collapsed, Japan launched a surprise attack on the Russian Pacific Fleet at Port Arthur on 9 February 1904. Both sides declared war. Japanese troops landed in Korea, crossed the Yalu River into Manchuria in May, and landed more forces on the Liaodong Peninsula. In August, Japan besieged Port Arthur, which fell in January 1905. In March 1905, after heavy fighting, Japanese forces captured Mukden, the Manchurian capital. The Russian Baltic Fleet, after a seven-month, 18,000-nautical-mile voyage from the Baltic Sea, arrived in May and was destroyed by the Japanese Combined Fleet at the Battle of Tsushima. The war ended with the Treaty of Portsmouth on 5 September 1905, mediated by U.S. President Theodore Roosevelt.

The treaty recognized Japanese interests in Korea and gave Japan Russia’s lease on the Liaodong Peninsula, control of the Russian-built South Manchuria Railway, and the southern half of Sakhalin Island. Japan’s complete victory—an Asian, non-Western nation defeating a European, Western power—surprised observers and shifted the global balance, with Japan emerging as a great power and Russia losing prestige among European states. Russia’s heavy casualties and humiliating defeat fueled internal unrest that led to the 1905 Russian Revolution, forcing the autocracy to make concessions. More broadly, Japan’s win undermined the credibility of European dominance across Asia.

**Historical background**

**Modernization of Japan** After the Meiji Restoration in 1868, Japan’s government adopted Western ideas, technology, and military methods. By the late 1800s, Japan had become a modernized industrial state. The Japanese sought recognition as equals to Western powers. The Meiji Restoration aimed to make Japan modern, not Western, and Japan pursued overseas expansion as an imperialist power.

**A Japanese sphere of influence** The United States saw Japan as an ally in controlling the Pacific and maintaining China’s Open Door Policy. In autumn 1872, U.S. minister Charles DeLong told U.S. General Charles LeGendre that he had urged Japan to occupy Taiwan and “civilize” its indigenous people, similar to how the U.S. had taken Native American land. LeGendre encouraged Japan to declare a sphere of influence modeled on the U.S. Monroe Doctrine, which excluded other powers from the Western Hemisphere. This would be the first such policy by a non-white state. The stated goal was to civilize Asia’s “barbarians.” LeGendre told the Japanese to “pacify and civilize them if possible, and if not…exterminate them or otherwise deal with them as the United States and England have dealt with the barbarians.”

From 1869 to 1873, the Seikanron (“Conquer Korea Argument”) split Japan’s elite: one side wanted to conquer Korea immediately, the other to wait until Japan was more modernized. No Japanese elite accepted Korean independence; only the timing was debated. As Europeans used the “backwardness” of other nations to justify conquest, Japan’s elite saw China and Korea’s “backwardness” as proof of inferiority, giving Japan the “right” to conquer them.

Foreign Minister Count Inoue Kaoru said in 1887: “What we must do is to transform our empire and our people, make the empire like the countries of Europe and our people like the peoples of Europe,” adding that China and Korea had forfeited their right to independence by not modernizing. Pressure for aggressive foreign policy came from below, with the “people’s rights” movement—which also called for an elected parliament—backing an ultra-nationalist line that assumed Japan had the “right” to annex Korea. This movement was led by those who had favored invading Korea in 1869–1873.