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.Recommended Stories list of 4 itemsend of listThe diplomatic spat began earlier in November when Taikachi, who took office only in October, made remarks about how Japan would respond to a hypothetical Chinese attack on Taiwan. Those remarks angered Beijing, which has demanded retractions, although the Japanese PM has not made one.However, the spat has now rapidly escalated into a trade war involving businesses on both sides, and has deepened security tensions over a contested territory that has long been a flashpoint for the two countries.Here’s what we know about the dispute: Japan has resumed seafood exports to China with a shipment of scallops from Hokkaido [File: Daniel Leussink/Reuters]What did Japan’s PM say about Taiwan?While speaking to parliame …