The US helped buy the yen, then said buying it is not enough

Three days after helping buy the yen, the US Treasury secretary said buying it is not enough. Scott Bessent wrote on August 4 that intervention is a signal that governments want to change direction, and that lasting yen strength has to come from policy. The yen now trades around 157 per dollar, back from about 163 in late July.

Japan and US confirm rare joint intervention to prop up yen (Al Jazeera, 2026-08-03)

출처: aljazeera.com

Al Jazeera reported that the two governments formally confirmed the July 31 joint action. It was said to be the first time Washington itself stepped in on the buying side of the yen since the 2011 earthquake.

What the US bought, and what Japan has not done yet

A currency intervention is a government using its own money to buy or sell its currency. When only sellers are left and the price slides one way, the state steps in as a large buyer to break the run. Japan did that alone on July 30, in an operation estimated at 8.45 trillion yen in a single day. The next day the US joined. That same day the Bank of Japan left its policy rate at 1%. It has been there since a hike on June 16. What actually moved in this episode was the currency market, not the rate.

The size of the intervention is not an official number yet

Japan's finance ministry discloses intervention amounts once a month. The latest disclosure, published on July 31, covers only June 29 through July 29. So there is still no official figure for what was actually spent on the 30th and the 31st. Every number in circulation is an estimate worked backwards from moves in Bank of Japan current account balances. The next disclosure is expected at the end of August.

U.S. dollar weakens sharply against the Japanese yen after market interventions (NPR, 2026-08-03)

출처: npr.org

NPR reported that the dollar fell steeply against the yen right after the operations. The move has held, but whether it reflects the intervention itself or an expectation about future policy is hard to separate at this point.

On September 18 it is the Bank of Japan's turn to answer

The policy Bessent is asking for is, in practice, the interest rate. The yen is cheap because the gap between US and Japanese rates is wide, and intervention does not narrow that gap. The Bank of Japan meets next on September 17 and 18, and market pricing puts the odds of a hike at roughly half. MUFG's research desk has a hike in September and another in January 2027 as its base case. If a hike lands in September, July's intervention will read as an operation that bought time; if the hold continues, intervention is all there is. The new element here is that a US Treasury secretary is discussing an ally's monetary policy in public.