China sent a letter to the United Nations vowing resolute self-defense if Japan “dared to intervene militarily in the Taiwan Strait,” as Beijing tries to rally international support for its position on the spiraling spat.

Japan plans to deploy medium-range surface-to-air missiles on Yonaguni – making it a frontline of defence in the event of a Chinese attack on Taiwan – as part of its broader military build-up across the southern island chain.

Chinese Foreign Minister Wang Yi says Japan has "crossed a red line” with comments by the country's new leader suggesting a potential military intervention over Taiwan

China fires off letter to UN accusing Japan of ‘threatening armed intervention’ over Taiwan - Beijing vows to defend its sovereignty as tensions with Tokyo escalate over Takaichi’s Taiwan remarks

Fu Cong, China's permanent representative to the United Nations, on Friday sent a letter addressed to United Nations Secretary-General Antonio Guterres, articulating the Chinese government's position on the erroneous words and deeds of Japanese Prime Minister Sanae Takaichi concerning Taiwan.

China has taken its dispute with Japan to the United Nations, sharply criticising Prime Minister Sanae Takaichi’s recent comments on Taiwan as the spat between the two neighbours deepens and tensions hit a new low.