.In fact, the fact that Dokdo is a Korean territory is already recognized a long time ago.
There are lots of evidence to prove it.
First of all, Geographical location of Dokdo is 89.493km from the southeast side of Ulleungdo, which is about 160km away from Japan. That means Dokdo is about 68km closer to Ulleungdo, an island of Korea than the Oki island of Japan. It is an obvious evidence that Dokdo is the territory of Korea.
Also, Dokdo is historically our territory. According to the book "The Chronicles of the Three States" of Korean history complied in 1145, in 512, Usanguk, an old name for Ulleungdo was subjugated to Silla when the army of Isabu, the monarch of the Silla kingdom, conquered Usanguk. Usando in later literature is the part of Usanguk and Usando is Dokdo. Therefore, since 512, Dokdo is a Korean territory.