Liancourt Rocks dispute Japan. In 1954, Japan proposed a reference to the International Court of Justice, which South Korea rejected, believing that the Liancourt Rocks are irrefutably South Korean territories, and thus should not be dealt through diplomatic negotiations or judicial settlement between South Korea and Japan. There are conflicting interpretations about the historical state of sovereignty over the islets. Korean claims are partly based on references to a Korean island called "Usan-do" in various historical records, maps and encyclopedias such as the "Samguk Sagi", "Annals of the Joseon Dynasty", "Dongguk Yeoji Seungnam" (), and "Dongguk munheon bigo" (). According to the Korean
Liancourt Rocks dispute a South Korean scientific expedition aboard Chinnam-ho and a fishing crew of 23 aboard Kwangyong-ho were attacked on Liancourt Rocks waters by a mono-propellered aircraft bearing the US insignia that disappeared in the direction of Japan after dropping four bombs. The Republic of Korea Navy had initially submitted an itinerary to the United Nations Naval Commander in Busan (CTG 95.7) on Sep 7 of the expedition to visit Ulleungdo Island and Liancourt Rocks September 14 and 15. Granted approval to travel to said areas by CTG 95.7, the expedition departed Busan on Sep 12 unaware of the United States-Japan Joint