The U.S. Treasury and Japan’s Finance Ministry confirmed a coordinated intervention to support the weakening Japanese yen last Friday. This joint effort aimed to counter excessive volatility and disorderly movements in the currency, which recently hit a 40-year low against the U.S. dollar. Japan’s Finance Minister Satsuki Katayama emphasized that Tokyo remains in close communication with Washington and will not hesitate to undertake further interventions if necessary.

The yen experienced sharp swings, hitting 163.73 per dollar on Thursday and then strengthening to 157.57 on Friday following the intervention. The joint operation followed a September 2025 agreement between the two countries to address major fluctuations. Japan also announced plans to use the Federal Reserve’s foreign and international monetary authorities repo facility, which allows central banks to obtain short-term dollars by exchanging U.S. Treasury securities, to aid future efforts.

U.S. Treasury Secretary Scott Bessent underscored the importance of the coordinated action, stating it helped stabilize the yen and affirmed continued close collaboration with Japan’s Ministry of Finance and the Bank of Japan. Bessent also expressed strong support for Japan’s monetary policies aimed at correcting the yen’s substantial undervaluation. President Donald Trump framed the intervention as a signal of friendship and a demonstration of the strong alliance between the two nations.

Some analysts, like Robin Brooks of the Brookings Institution, expressed caution about the long-term impact of the intervention. Reports indicated the U.S. sold euros, rather than dollars, to buy yen—a move that deviates from traditional intervention methods and could raise questions among investors about the intervention's effectiveness. Nonetheless, for now, the joint action reflects a shared commitment to maintaining currency stability amid global economic challenges.