Japan and China have escalated their war of words at the United Nations following unprecedented remarks from Japanese Prime Minister Sanae Takaichi about Tokyo’s role in a potential Taiwan conflict.

Japan’s ambassador to the UN wrote to Secretary-General Antonio Guterres on Thursday, disputing allegations from Beijing that Takaichi had violated “the basic norms governing international relations” while speaking to the Japanese Diet last month.

“The assertions contained therein are inconsistent with the facts, unsubstantiated, and are categorically unacceptable,” UN ambassador Kazuyuki Yamazaki wrote.

The letter marks the second time Japan has written to Guterres on the issue in as many months. Both times were in response to separate letters from China to the UN about Takaichi.

The di

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