Japan's yen defense called 'monetary defeat' as US-Japan intervention fails to hold

While some have called the first US-Japan coordinated currency market intervention in 28 years the culmination of a US-Japan monetary alliance, voices within Japan are drawing a far harsher conclusion — calling it a "monetary defeat." The episode, they say, exposed the reality that Japan can no longer defend the value of its own currency without American help. Underlying the self-criticism is a painful acknowledgment that Japan's economic troubles stem not from the exchange rate itself but from failures in macroeconomic management, including interest rate and fiscal policy.

The Nikkei Shimbun on Wednesday published an analysis piece titled "The US-Japan Coordinated Intervention Is a Monetary Defeat," framing the intervention not as a routine currency stabilization measure but as an event that laid bare the structural vulnerabilities of the Japanese economy.

The coordinated intervention was the first since the Asian financial crisis of 1998. At the time, Japan joined the United States in buying yen after a surge in bad loans at financial institutions sent the currency into a sharp decline. This time around, as the yen was pushed back toward 160 per dollar, Japan repeatedly intervened on its own but failed to arrest the slide, ultimately turning to Washington for a joint response.

What the Nikkei focused on was not the coordinated intervention itself, but the circumstances that made it necessary.

Japan had repeatedly tried to stem yen weakness through market intervention, but markets concluded that the currency would keep falling as long as the Bank of Japan's slow pace of interest rate normalization and loose fiscal policy remained unchanged. Markets sold the yen to pressure a policy shift; Japan intervened to push back but found its efforts insufficient, and ultimately had no choice but to seek US support.

US President Donald Trump made no effort to conceal this dynamic. Speaking to reporters recently, he said Japan had asked him to help address the yen's decline, and went on to say he viewed the coordinated intervention as a "deal" — in the same category as currency support for Argentina or assistance to chipmaker Intel. The message was clear: Japan asked, and the United States agreed.

US Treasury Secretary Scott Bessent also publicly warned that the yen would weaken again if Japan did not change its macroeconomic policies.

In interviews with the Nikkei and CNBC, Bessent said the yen would return to "a more normal equilibrium price" if Japan implemented appropriate policies. He also explained the US rationale for joining the intervention by pointing to how closely Asian currencies track the yen — a signal that Washington viewed a sharp yen decline as a potential trigger for financial instability across Asia and increased volatility in the US government bond market.

The Nikkei said the current situation bears a striking resemblance to 1998.

Then, too, Japan knew it needed to reform its financial system but delayed dealing with bad loans because of the political cost. The US-coordinated intervention bought time, but reforms were postponed — and Japan went on to endure prolonged deflation and a financial crisis.

Lawrence Summers, then US deputy treasury secretary and later treasury secretary, visited Japan at the time and pressed the government to change course while the "window of opportunity" was still open. The message was that since the United States had bought time through market intervention, Japan needed to press ahead with structural reform.

Twenty-eight years on, the message from Washington to Tokyo has not changed much.

Bessent has repeatedly stressed that Japan must use the time secured by the coordinated intervention to normalize interest rates and restore fiscal discipline. Market intervention, he has made clear, can only buy time — it cannot address the root causes of yen weakness.

The yen rebounded immediately after the coordinated intervention but has since slipped back to around 159 per dollar, a sign that the effect is fading. Markets widely expect yen weakness to resume unless Japan follows through with changes to its monetary policy.

The Nikkei said interpreting the coordinated intervention as a "monetary alliance" amounts to ignoring reality. It was not a partnership between equals — it was the result of Japan failing to defend its own currency and being forced to ask the United States for help.