I found that the sea between the Korean peninsula and Japan was labeled as the ¡°Sea of Japan¡± instead of the ¡°East Sea¡± in your title.
Unfortunately, this is an error. The name ¡°Sea of Japan¡± was first used during the period of Japanese Imperialism. But the sea had been called the ¡°East Sea¡± for more than 2,000 years originally.
This fact is base on various historical evidence. The correct indication of this sea is not the Sea of Japan; this expression is a reminder of Japanese colonialism and therefore should be refrained from use.
Therefore, The sea ¡° between Korea and Japan should be correctly expressed as the ¡°East Sea¡±.
Unfortunately, Japan has been continuously arguing that the East Sea is the Sea of Japan and that the island Dokdo is their land. To counter this, the Dokdo Cyber press corps are engaged in helping the world to know the truth of Dokdo and the East Sea.