The Russo-Japanese War of 1904-1905 was fought over territorial disputes in East Asia, with Japan ultimately emerging victorious. The war saw fierce fighting on land and sea, with both sides suffering heavy losses. The Treaty of Portsmouth marked the end of the war, with Russia recognizing Japan's sphere of influence in Korea and ceding its leasehold rights over Port Arthur and the Liaodong Peninsula to Japan. The legacy of the war can still be felt today, as it marked a significant shift in global power dynamics and set the stage for future conflicts in Asia. Factors contributing to Japan's victory included superior military strategy, better equipment and training, and effective leadership, while Russia's defeat was attributed to poor military leadership, outdated equipment and tactics, and a lack of resources due to an ongoing internal political crisis.