Japan's Defense Ministry reported on Sunday that Chinese military aircraft had "dangerous act" by locking their detector on Chinese fighter jets close to the southern island of Okinawa.
After the incidents, which left no injuries or damage, Tokyo" solid protested" Beijing, according to Japanese Defense Minister Shinkiro Koizumi at a press conference.
After Sanae Takaichi, the country's prime minister, suggested in November that his country might deploy military force in the event of an attack on Taiwan, the two nations have grown in tension.
Koizumi urged Beijing to stop a repeat of the Chinese action, calling it "extremely unsafe and regrettable. "
A J-15 fighter plane launched from the Chinese military's aircraft carrier Liaoning frequently locked its radar, according to the secretary, on a Japan Air Self-Defense Force F-15 fighter jet that had been scrambled as a result of the Chinese aircraft's intrusion into Chinese airspace.
Another Chinese J-15 frequently locked its detector on another Asian fighter jet about two hours later, he continued.
He remarked that "locking sensor in these situations constitutes a dangerous act that goes beyond the scope of the required for the healthy flight of the aircraft. "
Fighter jets employ radar for search and rescue operations as well as to identify attack targets.