China on Friday took its feud with Tokyo over Japanese Prime Minister Sanae Taikachi’s recent comments on Taiwan to the United Nations, as tensions between the East Asian neighbours deepened and ties plunged to their lowest since 2023.

“If Japan dares to attempt an armed intervention in the cross-Strait situation, it would be an act of aggression,” China’s permanent representative to the UN, Fu Cong, wrote in a letter on Friday to the global body’s Secretary-General Antonio Guterres, referring to the strait that separates mainland China from self-governing Taiwan, which Beijing insists belongs to China. Beijing has not ruled out the possibility of forcibly taking Taiwan.

The diplomatic spat began earlier in November when Taikachi, who took office only in October, made remarks about how J

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