China fighter jets lock radar on Japan planes as tensions rise

Tokyo has vowed a 'calm and resolute' response as tensions with Beijing continue to escalate.

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Locking radar onto an aircraft is considered a threat because it can signal a potential attack. Japan said there were two such incidents Saturday off its southern Okinawa islands.

Japan said it scrambled fighter jets in response to the Chinese J-15 fighter jets, while Beijing accused Tokyo of "harassing" its forces during a training exercise. No injuries or damage were reported.

Diplomatic ties between Japan and China have spiralled since last month, after Japanese Prime Minister Sanae Takaichi suggested that Tokyo could take military action if Beijing attacked Taiwan.

Beijing views self-governed Taiwan as part of its territory and has not ruled out the use of force to "reunite" with it.