According to the ministry, a South Korean survey ship was noticed on the day dropping obvious wires into waters inside Japan’s unique financial zone southwest of the islets.
Hiroyuki Namazu, director-general of the ministry’s Asian and Oceanian Affairs Bureau, lodged a protest by phone the identical day with a senior official on the South Korean Embassy in Tokyo, arguing that the survey was unacceptable and must be stopped instantly.
It was the fourth time this 12 months that Japan has protested a South Korean maritime survey close to Takeshima.
The South Korean aspect gave no prior discover of the most recent survey, in response to the Japanese ministry.