The United States and Japan have confirmed a rare, coordinated yen-buying intervention aimed at stopping a sharp slide in the Japanese currency that pushed it towards 40-year lows.
Markets moved as officials signalled resolve
The Japanese Ministry of Finance said the joint operation with the US Treasury department “countered excessive volatility and disorderly movements in the Japanese yen in recent months”, and that it remains in close communication with Washington and “will not hesitate to conduct further joint intervention”.
The confirmation followed remarks by US President Donald Trump, who framed Washington’s assistance as a friendly gesture. In response to a reporter’s question, he said:
“They have a weakening yen, and they wanted a little bit of help. And we’re always there for Japan.”
Currency markets reacted to the statements. The dollar initially slipped to ¥157.07 after Mr Trump’s comment, off the near four-decade peak close to ¥164 reached late last month, but then recovered to around ¥157.70 once Tokyo issued its statement.
Scale and context of intervention
Bank of Japan data indicated Tokyo may have sold as much as $58.97 billion to buy yen in New York markets on Thursday, prior to the confirmed joint action on Friday. Officials said the co-ordinated step was intended to prevent further disorderly moves that could spill over into global bond markets and add upward pressure to already rising US Treasury yields.
Analysts have pointed to the dual risks of a sharply weaker yen: higher import prices that feed domestic inflation and pressure on Japanese households, and volatility that can ripple through global fixed-income markets. Japanese authorities also face political fallout at home; persistent currency weakness has contributed to rising consumer costs and dented the approval ratings of Prime Minister Sanae Takaichi.
- Action type: Co-ordinated yen-buying intervention by Japan and the US
- Nearby market levels: Dollar fell to ¥157.07, rose to ¥157.70 after Tokyo statement
- Previous joint intervention: 2011, when partners co-ordinated to weaken the yen
- Estimated Tokyo selling: $58.97bn in New York markets (Bank of Japan data)
Why Washington joined
The US Treasury’s participation reflects concern about global spillovers from disorderly moves in the yen and Japanese government bonds. Sharp moves in those markets can reverberate through global capital markets, affecting yields and investor sentiment. US Treasury officials publicly confirmed their involvement, underlining a shared objective of market stability.
For Japan, buying yen is a tool to blunt the inflationary impact of a cheap currency. A weaker yen makes imports more expensive, translating into higher prices for fuel, food and manufactured goods — a blow to household budgets and a political headache for the government.
| Item | Figure |
|---|---|
| Dollar after Trump remark | ¥157.07 |
| Dollar after MOF statement | ¥157.70 |
| Near 40-year high | ~¥164 |
| Estimated Tokyo selling (NY) | $58.97bn |
The joint move is notable because it is the first confirmed co-ordinated intervention since 2011, which at the time was aimed at weakening the yen in the aftermath of a major earthquake. This iteration has the opposite intent: to shore up the currency and prevent disorderly depreciation.
While the immediate effect was a modest stabilisation of the dollar-yen rate, the Ministry of Finance left the door open to additional interventions should volatility persist. That stance will be closely watched by markets: repeated or larger-scale interventions can have limited longevity if underlying market forces — such as divergent monetary policies and disparate yield trajectories — remain in place.
For now, Tokyo and Washington have signalled a shared priority: contain disruptive currency moves that threaten domestic price stability and broader market calm. The effectiveness of the intervention will become clearer in coming sessions as traders assess both the size of official activity and the economic drivers behind the yen’s weakness.
