The Chino-Japanese War was one of the first wars that would eventually lead to World War III. It involved China's allies, The Russian Federation, and would begin the formation of the Union of Supreme Nations or USN.
At one point, China had tried to convert Japan to Communism. Japan refused, calling it an infection that needs to be destroyed. This outraged China, who invaded Japan sparking the War.
It began in March 16, 2014 and ended on December 25, 2015.