The infringements were the first by Russia in five years, according to the Japanese defense ministry. A fighter fired a warning flare in response.
A Russian military patrol plane breached Japanese airspace off the country’s northwestern coast three times on Monday, prompting Japan’s military to dispatch a fighter jet to issue radio warnings and, for the first time, to use a signal flare to deter the Russian aircraft.
According to Yoshimasa Hayashi, the chief cabinet secretary to Prime Minister Fumio Kishida, the Russian plane flew above Rebun Island, which is northwest of Hokkaido, Japan’s northernmost prefecture, between 1 p.m. and 3 p.m. on Monday afternoon.
“This violation of our airspace is extremely regrettable,” said Mr. Hayashi, in remarks to reporters on Monday afternoon. “We have lodged an extremely strong protest with the Russian government through diplomatic channels and have strongly urged them to prevent a recurrence.”
This was not the first time that a Russian military plane had violated Japanese airspace but it was the first time that Japan’s military had responded with a flare to warn the plane to leave. Last month, a Chinese military aircraft flew into Japan’s territorial airspace and the government said it was the first known incursion by the Chinese military.
Minoru Kihara, Japan’s defense minister, said Japan’s military had dispatched F-15 and F-35 fighter jets but that there had been “no particularly dangerous acts by the Russian aircraft.”
According to Japan’s defense ministry, the flights on Monday represented the 44th known incursion by a Russian plane — or an aircraft suspected to be Russian — since 1967, but it was the first time that a Russian military plane had breached Japanese territorial airspace since June 2019.
Mr. Kihara noted that both Chinese and Russian naval vessels had passed this week through the Soya Strait between Hokkaido and Sakhalin, a Russian island about 25 miles north of Hokkaido. Mr. Kihara said it was possible that the movement of the ships and the Russian aircraft were related.
Mr. Hayashi said the Japanese government did not know the “intentions and goals” of the Russian military aircraft. He said Japan would “take all possible measures to ensure vigilance and surveillance.”
The prime minister is in New York to attend the United Nations General Assembly, and Mr. Hayashi said he had advised Mr. Kishida to “respond calmly and resolutely” and to cooperate closely with the United States.
Russia’s embassy in Tokyo referred requests for comment to the defense ministry, which did not immediately respond.
Anton Troianovski contributed reporting from Berlin.
Motoko Rich is a reporter in Tokyo, leading coverage of Japan for The Times. More about Motoko Rich
Kiuko Notoya is a Tokyo-based reporter and researcher, covering news and features from Japan. More about Kiuko Notoya
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