Actually, not just three but all the nations mentioned in the chart were allies of the United States in the war with Japan.
Britain fought Japan in the Asian mainland and the Indian Ocean, through its colonies in India and South East Asia.
France did the same through its colonies in the Pacific, such as Tahiti and New Caledonia.
Australia, the biggest Pacific nation, provided help to Britain as it was a semi-independent former British colony.
China was the first country to get involved in the war against Japan, as it was invaded by the Imperial Forces in 1937.
Russia entered in war against Japan at the end of the conflict, in 1945, attacking Korea through the north.
