Moreover, the dispute over the Takeshima islands has undermined efforts to expand Japanese-South Korean security cooperation.

FORBES: It's Time To End Japan's Defense Dependence On The United States

Multiple historical documents confirm that Japan had established sovereignty over Takeshima at least by the mid-17th century.

ECONOMIST: Letters

In light of the historical facts and based upon international law, Takeshima is an integral and inherent part of Japanese territory.

ECONOMIST: Letters