Japan interferes with 74 South Korean maritime surveys near Dokdo

Data released by National Assembly member Lee Ki-heon reveals that Japan has interfered with South Korean maritime surveys near Dokdo 74 times over the past five years (2022 to August 2026). Out of 150 total surveys conducted by the South Korean government, nearly half—49.3%—faced interference from Japanese vessels.

The frequency of these incidents has increased significantly, doubling from 10 cases in 2024 to 20 cases in 2025. In August 2026, all four maritime surveys conducted by South Korea were reportedly obstructed by Japan.

Japanese interference primarily involves Japan Coast Guard patrol vessels closely monitoring South Korean survey ships and broadcasting warnings claiming the activities are illegal within Japan's Exclusive Economic Zone (EEZ). Despite South Korea issuing at least four official diplomatic protests this year regarding issues such as textbook distortions and defense white papers, tensions remain high. In August, the Japanese Ministry of Foreign Affairs even filed a protest against South Korea, claiming a survey vessel, the Tamhae 3, operated without prior consent.

Representative Lee emphasized that Dokdo is historically, geographically, and under international law, South Korean territory. He called for the government to move beyond routine diplomatic protests and establish strengthened field response manuals to effectively protect maritime sovereignty.