Can Official Warnings Against Rapid Currency Moves Sustain the Japanese Yen’s Relief?

• Can the Japanese Yen hold its gains as intervention warnings pressure USD/JPY near 160.00?
• The Yen finds some respite as the US Dollar eases modestly, but hawkish Fed expectations cap its recovery.
• The pace of additional rate hikes faces uncertainty after cautious comments from BoJ policymaker Toichiro Asada.

The risk of Japanese intervention is back in the spotlight, with USD/JPY edging lower on Thursday after approaching 160.00. Expectations of more aggressive Federal Reserve (Fed) rate hikes had supported the US Dollar (USD), lifting the pair to 159.94, its highest in more than two months. At the time of writing, the pair is trading around 159.70, a decline of 0.10% for the day.

Describing recent currency movements as too rapid, Japan’s top currency diplomat, Atsushi Mimura, warned on Thursday that “it’s still too early to forget what happened this summer.” Between July 30 and August 3, Japan spent a record ¥15.4 trillion on Yen purchases over three days. The action followed the currency’s slide to nearly 164 per US Dollar, its weakest level in about 40 years.

Can Japan defend the Yen as USD strength makes intervention harder?

Recent comments from Japanese officials “sends a strong signal that Japan is prepared to intervene again to support the Yen,” according to analysts at MUFG/BTMU. They believe this stance “should help to limit further upside for USD/JPY beyond 160.00.” Their assessment comes with a caveat: “it will be even more difficult to reverse the upward trend for USD/JPY right now with the USD strengthening broadly on the back of expectations for faster Fed rate hikes.” On the implications for other Yen pairs, they add that “if the rising risk of further intervention helps to stabilize USD/JPY while the US Dollar continues to strengthen more broadly, it could see non-USD Yen crosses moving lower.”

Some of the pressure on the Japanese Yen (JPY) has nevertheless eased on Thursday as the US Dollar (USD) retreats modestly. After touching 103.08, its highest since April 2025, the US Dollar Index (DXY) is trading near 102.88. The index measures the Greenback against six major currencies.

A December Fed rate hike is now fully priced in by traders. A 25-basis-point (bps) increase is seen as the most likely outcome, although a small probability remains of a larger 50 bps move. Expectations strengthened following this week’s hotter-than-expected US consumer inflation figures and calls by Fed officials for additional hikes to return inflation to the 2% target.

For the Bank of Japan (BoJ), board member Toichiro Asada struck a cautious note, warning that “rate hikes may harm the economy, reduce core inflation.” With the policy rate within the neutral range, he said a “further hike could have greater effect on the economy” and stressed that the BoJ “must be cautious about the pace of increases.” Pointing to weak growth and consumption, Asada also said that current price rises “aren’t necessarily fueled by demand”.

For further indications of the Fed’s December decision, traders are looking to the weekly US jobless claims release later on Thursday, followed by Friday’s Producer Price Index (PPI).