Both the Soviet Union and Japan regarded the Primorsky Krai as a strategic location in World War II, and clashes over the territory were common. The Soviets and the other Allies considered it a key location for the planned invasion of Japan through Korea; Japan viewed it as a key location to begin a mass invasion of Eastern Russia. The Primorsky Krai served as the Soviet Union's Pacific headquarters in the war to plan an invasion for allied troops of Korea in order to reach Japan.