TOKYO — Japan said on Sunday that Chinese fighter jets had aimed their radar at Japanese military aircraft in two “dangerous” incidents near Japan’s Okinawa islands, an account Beijing disputed.

“These radar illuminations are a dangerous act that went beyond what is necessary for the safe flight of aircraft,” Prime Minister Sanae Takaichi told reporters, adding that Japan had lodged a protest with China over Saturday’s “extremely regrettable” incident.

Defense Minister Shinjiro Koizumi, meeting with his Australian counterpart Richard Marles in Tokyo, said Japan would respond “resolutely and calmly” to China’s conduct in order to maintain regional peace and stability.

But a Chinese navy spokesperson, Colonel Wang Xuemeng, said Japanese aircraft had repeatedly approached and disrupted the

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