This war in which the Japanese cruiser Tokiwa played a large part was fought between which two groups?
Japanese cruiser Tokiwa:  She played minor roles in the Boxer Rebellion of 1900 and World War I, but was very active during the Russo-Japanese War of 1904–05 where she participated in the Battle of Port Arthur, the Battle off Ulsan, and the Battle of Tsushima. Russo-Japanese War: The Russo–Japanese War (Russian: Русско-японская война , "Russko-yaponskaya voina"; Japanese: 日露戦争 "Nichirosensō"; 1904–05) was fought between the Russian Empire and the Empire of Japan over rival imperial ambitions in Manchuria and Korea.
the Russian Empire and the Empire of Japan