Strategists say US-Japan yen intervention is built to fail

Treasury Secretary Scott Bessent's decision to join Japan in a rare coordinated intervention to support the yen — the first joint U.S.-Japan yen-buying operation since 1998 — is drawing skepticism from currency strategists who argue the effort cannot produce a lasting recovery without fundamental shifts in monetary policy.

The Intervention

Japan's Finance Ministry confirmed on August 3 that it conducted a coordinated yen-buying operation with the U.S. Treasury on July 31, spending an estimated $34–36 billion to arrest the currency's slide to 40-year lows near ¥164 per dollar. The intervention initially pushed the yen sharply higher, but by the end of the following week the currency had drifted back, trading around ¥157.76 per dollar.reuters+2

Bessent told CNBC that an excessively weak yen risked triggering competitive devaluations across Asia, comparing the situation to the 1997 Asian financial crisis. The Treasury sold euros rather than dollars to purchase yen, using the Exchange Stabilization Fund — a maneuver designed to avoid putting upward pressure on U.S. Treasury yields.koreatimes+2

Why Strategists Say It Will Fail

According to analysis from Yardeni Research published by Yahoo Finance, three structural problems undermine the intervention. First, Prime Minister Sanae Takaichi's economic agenda still benefits from a weaker yen, which supports Japanese exporters and corporate profits. Second, the interest-rate gap between the two countries remains wide: Japan's 10-year government bond yield sits around 2.8% compared with roughly 4.7% on comparable U.S. Treasuries, continuing to fuel carry trades that push the yen lower. Third, the intervention's design — selling euros rather than dollars — limits its effectiveness on USD/JPY and signals Washington's unwillingness to directly weaken the dollar.finance.yahoo

Mark Sobel of the Official Monetary and Financial Institutions Forum wrote on August 7 that "markets aren't disorderly; Japanese fundamentals just aren't changing" and suggested Bessent's primary motivation is protecting the U.S. Treasury market from Japanese reserve sales.omfif

Broader Risks

A Bloomberg editorial distributed by the Korea Times warned that the policy "fails to tackle the underlying problem and could easily backfire," noting that Bessent's plan to expand the Federal Reserve's FIMA Repo Facility to lend Japan dollars risks blurring the line between monetary and fiscal policy at a moment when investors are already seeking reassurance about the Fed's independence under Chairman Kevin Warsh.koreatimes

Without rate hikes from the Bank of Japan or cuts from the Federal Reserve, analysts say the yen's fate remains tied to fundamentals that coordinated intervention alone cannot alter.finance.yahoo+1