New prime minister says an attack on Taiwan could trigger the deployment of her country’s self-defence forces if the conflict poses threat to Japan

Japan and China are embroiled in a row about Tokyo’s potential military involvement in the event of a conflict over Taiwan.

Beijing reacted angrily this month after Japan’s new prime minister, Sanae Takaichi, said an attack on Taiwan could trigger the deployment of her country’s self-defence forces if the conflict posed an existential threat to Japan.

Insisting that Japan could exercise its right to collective self-defence – or coming to the aid of an ally – Takaichi said Tokyo had to “anticipate a worst-case scenario” in the Taiwan Strait.

If an emergency in Taiwan involved “warships and the use of force, then that could constitute a situation threatening [Japan’s] survival, whichever way you look at it”, she told a parliamentary committee. “The so-called Taiwan contingency has become so serious that we have to anticipate a worst-case scenario.”