The Russo-Japanese War was the first global conflict of the modern era and the first war in which an emerging Asian nation defeated a European great power.
The Japanese victory inflamed Asian nationalism and contributed to the struggle against colonialism throughout the region. The military debacle exposed the weakness of the tsarist regime and is usually considered the prime cause of the Revolution of 1905.
After the complete defeat of Russia’s land and naval forces, the tsar sued for peace. U.S. president Theodore Roosevelt brokered the Treaty of Portsmouth (August 23, 1905), but the Japanese believed that they had lost the peace and did not trust Western diplomacy again until after World War Two.