Military conflicts similar to or like World War II

Military conflict that was primarily waged between the Republic of China and the Empire of Japan. Known as the War of Resistance against Japanese Aggression, or as the oriental theatre of the World Anti-Fascist War, the latter term originating from Mao Zedong's wartime alliance with Stalin. Wikipedia

The theater of World War II that was fought in Asia, the Pacific Ocean, the Indian Ocean, and Oceania. Geographically the largest theater of the war, including the vast Pacific Ocean theater, the South West Pacific theater, the South-East Asian theater, the Second Sino-Japanese War, and the Soviet–Japanese War. Wikipedia

Theatre of conflict between the European Axis powers and co-belligerent Finland against the Soviet Union , Poland and other Allies, which encompassed Central Europe, Eastern Europe, Northeast Europe (Baltics), and Southeast Europe (Balkans) from 22 June 1941 to 9 May 1945. Known as the Great Patriotic War in the Soviet Union and some of its successor states, while everywhere else it was called the Eastern Front. Wikipedia

Area of heavy fighting across Europe, starting with Germany's invasion of Poland on 1 September 1939 and ending with the United States, the United Kingdom and France conquering most of Western Europe, the Soviet Union conquering most of Eastern Europe and Germany's unconditional surrender on 8 May 1945 . The Allied powers fought the Axis powers on two major fronts (the Eastern Front and Western Front) as well as in a strategic bombing offensive and in the adjoining Mediterranean and Middle East theatre. Wikipedia

Military conflict within the Second World War beginning soon after midnight on August 9, 1945, with the Soviet invasion of the Japanese puppet state of Manchukuo. The Soviets and Mongolians ended Japanese control of Manchukuo, Mengjiang (Inner Mongolia), northern Korea, Karafuto, and the Chishima Islands (Kuril Islands). Wikipedia

Swiftly conquered by Axis forces and partitioned between Germany, Italy, Hungary, Bulgaria and client regimes. Fought against the Axis occupying forces and their locally established puppet regimes, including the fascist Independent State of Croatia and the Government of National Salvation in the German-occupied territory of Serbia, by the communist-led republican Yugoslav Partisans. Wikipedia