China has escalated its growing dispute with Japan to the United Nations, accusing Tokyo of threatening military intervention over Taiwan and pledging, in its toughest language since the row began two weeks ago, that it will defend itself.

Japanese Prime Minister Sanae Takaichi committed “a grave violation of international law” and diplomatic norms when she said a Chinese attack on Taiwan could trigger a military response from Tokyo, China’s U.N. Ambassador Fu Cong wrote in a letter on Friday to U.N. Secretary-General Antonio Guterres.

“If Japan dares to attempt an armed intervention in the cross-Strait situation, it would be an act of aggression,” Fu wrote, according to a statement from China’s U.N. mission. “China will resolutely exercise its right of self-defence under the U.N. Charte

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