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The Japanese leader, Sanae Takaichi, vowed to act "with calm determination" following accusations that Chinese military jets locked their radar onto Japanese fighter jets southeast of Okinawa's primary island over the weekend.

A Concerning Incident Detailed

Per the Japanese Ministry of Defense, China's J-15 fighter aircraft from the aircraft carrier Liaoning activated its targeting radar on Japan's F-15s on two occasions on Saturday. The first incident took place at 4:32 p.m. and was repeated about two hours. Officials stated that a visual sighting could not be obtained due to the distance, adding that no damage or casualties were reported.

"This was an unprecedented instance Japan's defence ministry has reported such an incident," a report stated. Fighter jets routinely use radar to search and rescue.

Diplomatic Protest and Denials

Reacting to the allegations, China's military issued a statement rejecting them as "completely inconsistent with reality." The statement demanded Japan to "cease slandering and smearing." Conversely, Beijing asserted that Japanese Self-Defense Forces planes had "seriously endangered flight safety" by consistently flying near China's exercise areas. Beijing did not mention a radar lock-on.

A spokesperson for China's foreign ministry later called on Japan to "immediately stop its provocative actions of harassing China's routine military exercise and training."

Escalating Strains and Regional Background

Ties between China and Japan have deteriorated markedly over the past month. The downturn followed Prime Minister Takaichi stated that hostilities against Taiwan might lead to the dispatch of Japanese military if the situation presented an extreme danger to Japan.

She argued that Tokyo could invoke its legal authority to collective defense, which involves coming to the aid of a partner under attack. The Prime Minister stated that her country had to "prepare for the most severe possibilities" in the Taiwan Strait.

Japan's Defense Minister, Shinjiro Koizumi, described the encounter as "highly risky and deeply unfortunate." Subsequently, China's envoy to Japan, Wu Jianghao, was summoned on Sunday.

Japan's vice-foreign minister, Funakoshi Takehiro, lodged a "formal complaint" and demanded Beijing to "ensure that similar actions do not recur."

Longstanding Disputes

Japan and China are also locked in a protracted territorial dispute over a group of Senkaku Islands, called the Diaoyu in China. These small, unoccupied islets lie in waters between Okinawa and Taiwan.

Furthermore, regional frictions continue. Tokyo has been deepening military and strategic ties with the US and other allies in the Asia-Pacific region, a region where several nations are engaged in their own territorial and maritime disagreements with Beijing.

China, in turn, maintains vast sovereignty claims in the South China Sea, a posture that has drawn international concern.