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Tokyo says Chinese fighter jets repeatedly locked onto Japanese military aircraft with fire-control radar in two separate incidents on Saturday.
Japan's defence minister, Shinjiro Koizumi, condemned the alleged actions as "dangerous acts" and lodged a strong protest with China.
The incidents involved Chinese J-15 fighter jets from the aircraft carrier Liaoning allegedly targeting Japanese F-15s over international waters southeast of Japan's Okinawa island chain.
China denied Japan's claims, stating Japanese aircraft had repeatedly approached and disrupted their previously announced carrier-based flight training.
This marks a significant military escalation between the two nations, occurring amidst heightened tensions following remarks by Japanese prime minister Sanae Takaichi regarding Taiwan.