Original sentence: After, Sea of Japan appears increasingly, and was standardized 1919 by the IHO.However, the governments of North and South Korea challenge this name, contending it is a symbol of Japan's imperialistic past.Japan insists that it is called Sea of Japan, which has been the international de facto standard since the early 20th century.Neither the UN (UNCSGN) nor the International Hydrographic Organization (IHO) have so far accepted their claims.Since the 1990s, South Korea have increased their campaign efforts to change the sea's official international name.Some international and media organizations, however, have begun using the names Sea of Japan and East Sea together.The South Korean government and media use East Sea consistently in their publications.The South Korean government wants the name East Sea to be used, while the North Korean government prefers East Sea of Korea.There is a long-running controversy between Korea and Japan over what this sea should be called in English.This might also be caused by a general trend to use local names, since this is often considered politically correct.This sea is called by various names including Sea of Korea, Sea of Corea, or Sea of Japan on maps earlier than the 19th century
Edited sentence: Both Japan and Russia refer to it as "Sea of Japan".However, the governments of North and South Korea challenge this name, contending it is a symbol of Japan's colonial and imperialistic past in the region.Japan insists that it is called Sea of Japan (literally Japan Sea), which has been the international de facto standard since the Japanese Occupation.The South Korean government wants the name East Sea to be used or Sea of Korea (Corea), while the North Korean government prefers East Sea of Korea.There are four countries which border the Sea of Japan.There is a long-running controversy (mostly between Korea and Japan) over what this sea should be called in English.They are Russia, Japan, South Korea, and North Korea