 Although it is impossible for one to survive at Liancourt Rocks without outside assistance, a distinction to be noted is that Usanguk refers to a state based on Ulleng-do, whereas Usando refers to an island.Japanese scholars argue that Usando refers to either Ulleung-do or Jukdo while Korean scholars argue that it refers to Liancourt Rocks.The "Sejong-Sillok" (세종실록, "Chronicle of King Sejong", 1432) mentions Usando, but interpretation of the context is disputed.