What are the differences in the purposes of China and Russia's participation in the two world wars?

In order to regain the land lost by Germany during World War I, China regained the Jiaozhou Peninsula in Shandong. At that time, Duan Churui's government declared war on Germany. It was an unjust imperialist war in which Russia formed an alliance with Britain and France and the Triple Entente of Germany, Italy and Austria to compete for overseas colonies. China and Russia had to fight in World War II. Japan invaded the three northeastern provinces of China to establish the puppet Manchukuo, and then attacked North China, demanding autonomy for North China. In 1940, the Wang Puppet Nanjing Government was established, and the Chinese Nationalist Party signed a cooperative contract to resist Japan. When the Soviet Union was invaded by Germany, it won the battle to defend Moscow. Only 20% of Soviet men born in 1920 survived. The Soviet Union made huge sacrifices. The 26 countries of China, Russia, the United States, Britain and the Soviet Union established the World Anti-Fascist Alliance in 1942 to maintain world peace and fight against Germany, Japan, Italy and their servant countries.