The Japanese government said, "We have called attention to Korean ships that are conducting maritime investigations around Dokdo and strongly protested against the Korean government."
At a regular press conference on the morning of the 1st, Chief Cabinet Secretary Seiji Kihara said, "It was confirmed that a total of three Korean survey ships were sailing around Dokdo on the 24-27th, 26-27th, and 27-28th of last month." .
According to the local Sankei Shimbun, these survey vessels were the Onnuri, a marine research vessel belonging to the Korea Institute of Ocean Science and Technology, the Exploration 22 of the National Institute of Fisheries Science, and the Ocean 2000 of the National Institute of Ocean Science and Technology.
Sankei said, "The Japan Maritime Security Agency wirelessly alerted the investigation ship, but the South Korean side claimed sovereignty over Dokdo and received a call saying that it was a 'just investigation'."
Sankei added, "After leaving the territorial waters of (Dokdo), it appears that the Onnuri moved to Japan's exclusive economic zone along the Korea-Japan midline and operated equipment for investigation."
Afterwards, the newspaper reported, "When the Gogu 22 and Haeyang 2000 showed up, a Japanese Coast Guard patrol boat carried out vigilance monitoring."
Japan, which adheres to its unreasonable claim to Dokdo, has unilaterally set the waters surrounding Dokdo as its own EEZ and has protested against Korea's maritime investigation activities.
Earlier, in May and June, when the National Oceanic and Atmospheric Research Service of Korea conducted a regular ocean survey around Dokdo, it demanded that it be stopped.
In response, the Korean government dismissed Japan's assertion, stating that "it cannot accept one side's concerns about legitimate activities conducted in accordance with international law, such as the United Nations Convention on the Law of the Sea, and related domestic laws and regulations."