---
title: "Why the U.S. Stepped In to Save Japan's Yen — and What It Risks"
h1Title: "Why the U.S. Stepped In to Save Japan's Yen — and What It Risks"
seoTitle: "Why the U.S. Sold Euros, Not Dollars, to Save the Yen"
description: "The U.S. Treasury sold euros, not dollars, to buy yen in the first joint U.S.-Japan intervention since 1998, after USD/JPY hit a 40-year low of ¥163.73."
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author: "Khanh Nguyen"
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publishedAt: "2026-08-05T10:01:44Z"
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keywords: "yen intervention 2026, US Treasury yen purchase, USD/JPY 40-year low, coordinated currency intervention, FIMA repo facility, Japan government bond yields"
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# Why the U.S. Stepped In to Save Japan's Yen — and What It Risks
The U.S. Treasury bought yen alongside Japan's Ministry of Finance on July 31, funding the purchase with euro sales instead of dollar sales — a mechanical choice that hints at what Washington was really trying to protect.
## Treasury Sold Euros, Not Dollars, to Fund the Yen Purchase
The yen had slid to ¥163.73 per dollar, [its weakest level in roughly four decades](https://www.cnbc.com/2026/08/03/japan-yen-intervention-us-treasurys-euros-.html), when the Federal Reserve Bank of New York executed the purchase on the Treasury's behalf through Goldman Sachs and Morgan Stanley. Rather than selling dollars — the standard tool in prior interventions — [the New York Fed sold euros to buy yen](https://www.hawaiitribune-herald.com/2026/08/01/nation-world-news/us-treasury-intervenes-to-support-yen-after-japan-steps-in-ft-reports/), a detail first reported by the Financial Times and confirmed through people familiar with the matter.
That distinction matters. Selling dollars to prop up the yen would have meant flooding the market with the same currency that underpins Treasury bond demand, at a moment when foreign appetite for U.S. debt is already fragile. [Routing the trade through euros instead](https://www.cnbc.com/2026/08/04/cnbc-daily-open-yen-intervention-dollar-euro-fx.html) let Washington support Tokyo without adding pressure to its own funding markets. U.S. Treasury Secretary Scott Bessent confirmed the coordinated action in a statement, saying the joint move "countered disorderly yen movements," and added that Treasury "will not hesitate to participate in further joint intervention" [if conditions require it](https://www.cnbc.com/2026/08/03/yen-intervention-us-japan-trump-bessent-katayama.html).
*Visual chart representation (SVG Source Code):*
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## The Last Time Washington Joined a Yen-Buying Intervention Was 1998
Japan has intervened in the currency market repeatedly over the past two decades, but almost always alone — selling dollars to buy yen in 2022 and again in 2024 as the currency fell to fresh multi-decade lows. [What made July 31 different](https://www.cnbc.com/2026/08/03/japan-yen-intervention-us-treasurys-euros-.html) was direct U.S. Treasury participation in a yen-buying operation, something that had not happened since a joint intervention in June 1998, when the yen was sliding toward ¥147.
President Donald Trump had earlier said the U.S. participated as [a gesture of support for Japan and in the interest of global economic stability](https://www.cnbc.com/2026/08/03/yen-intervention-us-japan-trump-bessent-katayama.html). Japan's Finance Ministry, for its part, said it "will not hesitate to conduct further coordinated interventions in the future" and confirmed plans to draw on the Federal Reserve's Foreign and International Monetary Authorities repo facility for future actions — a tool that lets a foreign central bank borrow dollars against Treasury securities [without having to sell those securities outright](https://www.axios.com/2026/08/03/yen-japan-treasury-bessent).
*Visual chart representation (SVG Source Code):*
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## Rising Japanese Bond Yields Are the Real Worry Behind the Intervention
Currency traders were not the only audience for Friday's move. [Japanese government bond yields have been climbing toward multi-decade highs](https://www.cnbc.com/2026/07/14/japan-bond-jgb-yields-.html) for months, with the 10-year JGB touching levels not seen since 1996 as the Bank of Japan normalizes policy and investors weigh Tokyo's fiscal spending plans. A persistently weak yen compounds that pressure: it raises the cost of imported oil and food, and — as State Street senior macro strategist Masahiko Loo told CNBC — [a falling yen risks triggering further selling in Japanese government bonds](https://www.cnbc.com/2026/08/03/japan-yen-intervention-us-treasurys-euros-.html), with higher yields spilling into global bond markets at a time when both Japan and the U.S. are already grappling with rising long-term borrowing costs.
Reuters reporting cited by outlets covering the intervention indicated Japan may have sold as much as $58.97 billion on its own to buy yen the Thursday before the joint action — a scale that underscores how much pressure had built up before Washington stepped in.
*Visual chart representation (SVG Source Code):*
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```
## Why Analysts Doubt the Rally Will Hold
The intervention worked in the short term — the yen moved from roughly ¥163 to ¥157.57 against the dollar within a day — but market strategists cited across the coverage were quick to note that the currency's underlying fundamentals haven't changed. ING's head of markets, Chris Turner, pointed out that the dollar's resilience after the intervention likely [reflects unresolved questions over whether the Federal Reserve will raise rates in September](https://www.cnbc.com/2026/08/03/yen-us-intervention-japan-market-currency.html), since higher U.S. yields would keep pulling international demand toward Treasurys and away from yen-denominated assets. HSBC analysts, in the same coverage, argued that a sustained rally in the yen would require a structural shift in the Bank of Japan's underlying policy stance, not just a one-time coordinated purchase.
That leaves both governments in a familiar position: signaling readiness to intervene again while the deeper imbalance — a policy rate gap between Washington and Tokyo, and a Japanese bond market under its own separate pressure — remains unresolved. Japan's Finance Ministry has said it "will not hesitate" to act again, and Bessent has said the same of Treasury. Whether that repeated readiness alone can hold the yen steady is, by the market's own assessment, still an open question.
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