When the Empire of Japan invaded China in 1937, sparking the Second Sino-Japanese War, Mao agreed to a united front with the KMT, and both sides fought with the Allies of World War II until Victory in the Pacific was achieved.
When the Empire of Japan invaded China in 1937, sparking the Second Sino-Japanese War, Mao agreed to a united front with the KMT. From 1941, both sides fought on the side of the Allies of World War II until Victory over Japan was achieved.