💴 US and Japan’s First Joint Yen Intervention Since 1998: Full Breakdown

In a move analysts call genuinely rare, the US Treasury joined Japan’s Ministry of Finance to buy yen directly — the first coordinated US-Japan intervention to support the currency since 1998. The yen had slid to 163.73 per dollar, territory not seen in nearly four decades, before rebounding sharply to 157.57 following the intervention.

📉 How Bad Had the Yen Gotten?

Metric	Detail
Yen’s low before intervention	163.73 per dollar
Level after intervention	157.57 per dollar
Last similar joint US-Japan operation	1998
US-Japan policy rate spread	Fed at 3.50–3.75% vs BOJ at 1.0%

📝 The Notepad That Confirmed It

The clearest signal came almost by accident: a Reuters photo caught US Treasury Secretary Scott Bessent’s notepad during a Camp David cabinet meeting reading “To Do: Buy Japanese Yen (JPY) $5-10 bil.” Hours later, both governments officially confirmed the coordinated action.

🔧 How the Intervention Worked

Rather than Japan selling US Treasury holdings to raise dollars (which risked destabilizing the Treasury market), the New York Fed sold euros to buy yen on the Treasury’s behalf — using EUR/JPY rather than USD/JPY. Japan also gained access to the Fed’s FIMA Repo Facility, letting it raise dollar liquidity by borrowing against Treasury holdings instead of selling them outright.

🤔 Why Did the US Get Involved?

Washington’s motivations reportedly go beyond diplomatic goodwill: a collapsing yen risked forcing Japan into large-scale Treasury sales to defend its currency, which would have pushed US long-term yields even higher — the 10-year Treasury has already climbed roughly 57 basis points since the start of 2026. A weak yen also risked dragging down other Asian currencies and widening the US trade deficit.

🎯 What’s Driving Yen Weakness

• A wide, persistent US-Japan interest rate gap
• Japan’s high debt levels, with the BOJ still owning roughly half of Japanese government bonds
• The Takaichi administration’s spending plans for tech, defense, and consumption
• Japan’s energy dependence, worsened by the ongoing Iran conflict’s impact on energy costs

🔮 What to Watch

Both governments say they “will not hesitate to participate in further joint intervention” if disorderly moves resume. For now, the intervention appears to have stabilized the pair, but the underlying rate differential driving yen weakness hasn’t gone away.

Disclaimer: This article is for informational purposes only and does not constitute forex trading advice. Currency markets are highly volatile. Consult a SEBI-registered financial advisor or authorized forex dealer before making decisions.

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