A photographer at Camp David caught Treasury Secretary Scott Bessent with his notepad exposed. It read "Buy Japanese Yen (JPY) $5-10 bil." On Tuesday he walked back the surprise and explained the whole operation to CNBC, confirming Washington had moved to prop up a currency that had crashed to levels not seen in four decades.

The yen had sunk to its weakest point since 1986. Japan and the US coordinated a joint intervention on Friday, buying the currency to push its price back up. Japan's Finance Minister Satsuki Katayama confirmed the move on Monday, saying Tokyo acted "in coordination with the U.S. Department of the Treasury" and promised more intervention if needed. The yen jumped over 1% immediately after the announcement, reaching ¥155.20 per dollar, its strongest level since early May.

Why Now, After Nearly Three Decades

The last time Washington bought yen was June 17, 1998. Back then the Treasury spent just $833 million. Bessent's leaked number points to six to 12 times more cash deployed this time around. The scale reflects how badly the currency had deteriorated and how seriously both governments view the risk.

This wasn't a random decision. Both countries signed an agreement last September to act together if the yen moved in a disorderly way. The leak just exposed the timing. Bessent downplayed the notepad incident itself, joking to reporters that he wanted them to know the ticker symbol. But he was serious about the substance.

"This is more than just a market intervention," he told CNBC. "Through our conversations with them, we believe that they are going to continue to put the right policies in place that will lead the yen to get back to more of a normal equilibrium price." He framed it as part of a longer strategy, not a one-day rescue.

Bessent also pulled a history lesson. He blamed part of the 1997 Asian Financial Crisis on a yen that had fallen too far, dragging neighboring currencies down with it. South Korea's won is already showing jitters today. A weak yen doesn't just hurt Japan, it sends ripples across the entire region, which is why both governments decided to act.

Tokyo hasn't released its own spending number yet. Estimates based on central bank cash flows suggest around $59 billion, but that's guesswork. Japan publishes the real figure on August 31.

This article is informational only and does not constitute financial or investment advice.