In 1905 U.S. President Theodore Roosevelt mediated peace. In the Treaty of Portsmouth both sides agreed to evacuate Manchuria and return its sovereignty to China. However Japan leased the Liaodong Peninsula (containing Port Arthur and Talien) and the Russian-built South Manchurian Railway in southern Manchuria with access to strategic resources.
In 1905 U.S. President Theodore Roosevelt played a key role in negotiating peace. The Treaty of Portsmouth resulted in both sides agreeing to withdraw from Manchuria and restore China's control over the region. However, Japan secured the Liaodong Peninsula (including Port Arthur and Talien) and the Russian-built South Manchurian Railway in southern Manchuria, gaining strategic access to vital resources.