For the first time in nearly three decades, the United States has joined Tokyo in intervening in foreign exchange markets to support the Japanese yen — a move that surprised investors accustomed to Washington’s longstanding preference for allowing currencies to find their own level.
The coordinated action came on Friday, July 31, after the yen slid to its weakest level against the U.S. dollar in almost 40 years, briefly approaching 164 yen per dollar before rebounding sharply.
The Federal Reserve Bank of New York sold euros from its strategic international reserves in order to make the trades on Friday, causing the yen to surge by over 1 percent to reach 157 yen to the dollar.
This “countered disorderly yen movements,” U.S. Treasury Secretary Scott Bessent wrote on X.
Prior to the official announcements, reporters at a White House press event on Friday had zoomed in on Bessent’s notepad to reveal the words “Buy Japanese Yen (JPY) $5-10 bil.”
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President Donald Trump later confirmed that the United States had participated in the operation, describing the objective as strengthening the yen, supporting Japan, and preserving global financial stability. “They wanted a little bit of help, and we’re always there for Japan,” Trump told reporters.
Japan’s Finance Minister, Satsuki Katayama, and Treasury Secretary Bessent have issued explicit, unified warnings to currency speculators, stating they will do “whatever it takes” and will not hesitate to execute further joint interventions if the yen faces renewed pressure.
The intervention is unusual not simply because of its rarity. It also reflects growing concern that a prolonged decline in Japan’s currency could create broader risks for global financial markets and reinforce geopolitical uncertainty in Asia.
More than a currency problem
Ordinarily, governments are reluctant to intervene directly in currency markets, particularly the United States, which has generally favored market-determined exchange rates.
This time, however, analysts say Washington’s concerns extended well beyond the value of the yen itself.
Japan is the largest foreign holder of U.S. Treasury securities. If Tokyo were forced to defend the yen on its own for an extended period, it could eventually need to liquidate part of those holdings to obtain dollars, potentially placing upward pressure on U.S. Treasury yields and adding volatility to already sensitive bond markets.
That concern helps explain why both governments highlighted the Federal Reserve’s Foreign and International Monetary Authorities (FIMA) Repo Facility, which allows foreign central banks to obtain dollar liquidity without immediately selling Treasury securities.
Economists say emphasizing the facility signaled that Japan has alternatives to large-scale Treasury sales if additional dollar funding becomes necessary.
Louise Loo, Lead Economist for Asia at Oxford Economics, argued that the intervention also buys valuable time for the Bank of Japan as it gradually normalizes monetary policy after years of ultra-low interest rates. She has also noted that U.S. policymakers have long viewed the yen as significantly undervalued, arguing that an excessively weak currency can distort trade competitiveness.
The underlying challenge, however, remains the large interest-rate gap between Japan and the United States.
Higher U.S. yields continue to encourage investors to borrow cheaply in yen and invest in higher-yielding overseas assets — a strategy known as the yen carry trade. As long as that incentive persists, economists say, downward pressure on the Japanese currency is unlikely to disappear.
Masahiko Loo, Senior Macro Strategist at State Street, has argued that intervention should be viewed primarily as a means of buying time rather than fundamentally reversing the market’s longer-term direction. Future movements in the yen, he suggests, will depend more heavily on the Bank of Japan’s monetary normalization than on official intervention itself.
A stronger alliance–and a message to Beijing
The intervention also carries geopolitical significance.
Jesper Koll, an expert at Monex, said the operation reflects “a new phase in the U.S.-Japan partnership,” demonstrating that when Japan requests assistance, Washington is prepared to respond.
That message may have been intended for more than financial markets.
Several analysts argue that close coordination between Washington and Tokyo sends a broader strategic signal to Beijing at a time of intensifying competition between the United States and China across economic, technological and security issues.
Vishnu Varathan, Head of Asia Macro Research at Mizuho Securities, argues that U.S. participation substantially increases the credibility of the intervention. Markets now know that Washington may be willing to intervene again if conditions deteriorate, making speculative bets against the yen considerably more risky.
The coordinated action also reassures investors that Japan is less likely to resort to large-scale sales of U.S. government debt, reducing another potential source of instability for global financial markets.
Buying time, not changing fundamentals
Whether the intervention ultimately succeeds remains an open question.
History offers mixed lessons. The United States and Japan last intervened jointly to support the yen during the 1998 Asian financial crisis, while the G7 coordinated intervention in 2011 sought the opposite objective — weakening an excessively strong yen following Japan’s devastating earthquake and tsunami.
Most economists argue that currency intervention can be effective in slowing disorderly market moves, particularly when multiple governments act together. Sustaining a stronger exchange rate, however, usually requires underlying economic conditions to move in the same direction.
For Japan, those fundamentals have changed only gradually.
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