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A single word can crack the facade of a great power’s confidence. That’s what happened last month when Prime Minister Sanae Takaichi of Japan told lawmakers in Tokyo that a Chinese attack or blockade against Taiwan would constitute a threat to Japan’s “survival,” a term that, under Japanese law, would permit the country to deploy its military overseas.

Ms. Takaichi merely said aloud what has long been understood — that a crisis involving Taiwan would threaten Japan’s national security. But her comments were among the clearest public signals yet that Tokyo could help defend Taiwan from potential Chinese aggression.

Beijing reacted as if Ms. Takaichi, a conservative politician, had declared war. Chinese state media has portrayed her as reviving the militarist rhetoric used to justify Japan’s aggression during World War II, and a senior Chinese envoy posted what amounted to an online threat to behead Ms. Takaichi. China has halted some Japanese imports, discouraged Chinese tourism to Japan and stepped up coast guard patrols around islands claimed by both countries.

Beijing routinely lashes out at Tokyo because of lingering resentment over Japan’s wartime past, which included a brutal invasion and occupation of China. This time, however, the fury is rooted in something more dangerous: China’s growing anxiety that one of its bedrock goals — isolating Taiwan and forcing it to submit to unification on Chinese terms — is slipping away.

The Chinese Communist Party has long assumed that time and pressure would slowly wear Taiwan down. If President Xi Jinping of China concludes that bet has failed, he may escalate to sharper forms of pressure sooner than planned. It is vital for regional security that Tokyo and Washington stand firm and signal clearly that increased Chinese coercion of Taiwan will trigger a coordinated response.

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Ms. Takaichi did not create this situation; years of relentless Chinese coercion did. Her remark merely made explicit what has long been implicit — that if Beijing keeps tightening the screws on Taiwan, it will inevitably pull in other democracies because the island’s fate now bears directly on their security.

Airing out the shared stakes faced by all the players in this equation, as Ms. Takaichi has done, is a surer path to stability than pretending that silence will keep the peace.

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Meanwhile, Taiwan’s PM said his country is ‘very moved’ by Japanese prime minister’s support.

“Recently, Prime Minister Takaichi’s remarks about stability and peace in the Taiwan Strait moved us all very, very much. They represent justice and peace,” Premier Cho Jung-tai said in Taipei.

“We are also extremely grateful to Prime Minister Takaichi and to the Japanese government and people for continuing to uphold this justice and peace under such strong pressure.”