Dramatic developments in global foreign exchange markets: The U.S. Department of the Treasury acted directly over the weekend to support the Japanese currency, which had recently been trading at historic lows not seen since 1986. According to a report by the Financial Times, the Federal Reserve Bank of New York executed sales of the euro currency in exchange for yen on behalf of the U.S. Treasury through Goldman Sachs and Morgan Stanley. This represents an extraordinary event in which Washington actively intervenes alongside Tokyo, with the last time the U.S. provided such direct support being in 2011, following the natural disaster and tsunami that struck Japan.

Wall Street preparations and rare documentation of the Treasury Secretary Prior to the execution of the transactions, sources in the financial markets reported that the U.S. Treasury informed several major banks of the potential intervention in the foreign exchange market and instructed them to prepare for heightened activity. Simultaneously, a press photograph captured during a cabinet meeting at the presidential retreat at Camp David revealed a handwritten note by U.S. Treasury Secretary Scott Bessent listing an explicit task to purchase Japanese yen in the amount of $5 billion to $10 billion. The reports of Washington’s intervention, coupled with expectations of a joint policy to be announced in the coming days, triggered a rapid surge in the yen’s value, with the dollar falling against it to approximately 157.6 yen, compared to a multi-decade high of nearly 164 yen recorded in recent weeks.

Tokyo’s policy toolkit and Federal Reserve support The U.S. intervention comes on the heels of aggressive measures by the Japanese Ministry of Finance, which, according to central bank data, sold tens of billions of dollars to execute yen purchases and counter speculative betting by traders. As part of its efforts to reassure capital markets and demonstrate high liquidity, the Ministry of Finance leadership in Tokyo clarified that it possesses a broad and diverse toolkit. Among other options, Japanese officials highlighted the possibility of utilizing the Federal Reserve’s FIMA Repo facility—a mechanism allowing Japan to raise dollar liquidity without needing to directly sell U.S. Treasuries, thereby easing pressure on global bond markets during large-scale interventions.

The coordinated move by Washington and Tokyo draws a clear line in the sand against speculators in the global foreign exchange market and reaffirms the G7 powers’ commitment to global financial stability. For international market investors, the immediate test will focus on the authorities’ capacity to sustain the Japanese currency’s stability over time, and whether the joint announcement expected in the coming week will incorporate deeper monetary policy adjustments capable of narrowing the core interest rate differentials between the two nations.