U.S. Treasury Sells Euros to Buy Yen; HSBC Says Move May Be Unprecedented
N.R. Finch
A joint U.S.–Japan intervention pushed the yen from a 40-year low of 164 to about 157 in a single week — the twist: Washington sold euros, not dollars, in what HSBC calls a "possibly unprecedented" move.
What exactly happened?
Japan's Ministry of Finance confirmed Monday it intervened jointly with the U.S. Treasury, pushing USD/JPY from 164 to roughly 157 — a nearly 4% weekly gain, the largest in two years.
The key anomaly: the U.S. Treasury did not sell dollars to buy yen. It sold euros to buy yen, executing the trade through the EUR/JPY pair.
This means → Washington joined the yen rescue but deliberately kept the dollar out of the picture.
Why avoid selling the dollar?
MUFG senior FX analyst Lee Hardman noted that with U.S. inflation still above target, a weaker dollar is not in America's interest.
In plain terms = if the U.S. had sold dollars directly, markets would read it as "Washington wants a cheaper dollar" — that would push import prices up and make inflation harder to tame.
Barclays analysts wrote that choosing euros was designed to frame the operation as "purely a yen matter", avoiding any signal of broad dollar weakness.
How did markets react?
EUR/JPY dropped from a Thursday high of 187.4 to below 180 — a fall of more than 4%.
Because major currency pairs reprice almost instantly off each other, the EUR/JPY move simultaneously reset USD/JPY and EUR/USD.
Bank of Japan data estimate that Japan bought roughly $36 billion worth of yen in Friday's joint intervention alone.
How much euro ammunition does the U.S. have left?
U.S. euro reserves total about €26 billion, split between SOMA (System Open Market Account) and the ESF (Exchange Stabilization Fund).
This means → the magazine is limited. MUFG's Hardman concluded the operation is unlikely to have a lasting impact on the euro.
This reflects a practical constraint: the "sell euros" playbook is hard to repeat — it looks more like a one-off signal than a sustainable tool.
What comes next?
The critical variable is whether the ECB follows suit. The ECB declined to comment but, per Reuters, has been in contact with the Fed on the matter.
HSBC analysts warned: if the ECB also sells EUR/JPY, "it would look like a currency accord among major economies to strengthen the yen" — a scenario HSBC labels "low probability, high impact."
Reuters also reported that South Korea sold dollars and bought won last week at Japan's coordination, suggesting the scope of coordination may be widening.
What is this really about?
Put simply = the U.S. helped Japan prop up the yen, but through a clever channel — selling someone else's currency instead of its own, preserving the surface consistency of "we are not weakening the dollar."
The short-term effect is clear: the yen gained nearly 4% in a week. Whether that becomes a sustained trend depends on whether the intervention stays bilateral or evolves into a broader multilateral currency accord.
This reflects a subtle reality in global FX politics: every major economy wants to influence exchange rates, but none wants the label of "currency manipulator."
Content is for reference only, not financial advice.