History of South Korea
On August 15, 1948, the Republic of Korea was formally established, with Rhee Syngman as the first president. With the establishment of Rhee's government, de jure sovereignty also passed into the new government. On September 9, 1948, a communist regime, the Democratic People's Republic of Korea (North Korea), was proclaimed under Kim Il-sung. However, on December 12, 1948, by its resolution 195 in the Third General Assembly, the United Nations recognized the Republic of Korea as the sole legal government of Korea.
First Republic of Korea
On January 18, 1952, Rhee declared South Korean sovereignty over the waters around the Korean Peninsula, in a concept similar to that of today's exclusive economic zones. The maritime demarcation thus drawn up, which Rhee called the "Peace Line", included Liancourt Rocks as South Korean territory.