 A South Korean scholar claims to have uncovered evidence that Korean fishermen effectively occupied engaged in "whaling" in Liancourt Rocks waters in the 1880s and that sea lions were hunted and sea-lion-derived products were exported to Japan in 1904 prior to the Japanese Cabinet decision of 1905 to incorporate a supposed terra nullius.The Japan–Korea Protocol of 1904 (; ) signed between Japan and Korea on February 23, 1904, stipulates in article 3 that Japan shall guarantee the territorial integrity of Korea.It further stipulates in article 4 that, in case the territorial integrity of Korea is endangered by aggression of a third power, Korea shall give full facilities to promote the action of Japan, and that Japan may occupy, when the circumstances require, such places as may be necessary for strategic reasons.