USD/JPY traded little changed near 159.05 in early Asian trading on Wednesday. The pair’s rise was capped by concerns that Japanese authorities could step into the market.
Markets followed headlines on US talks with Iran aimed at ending the war. Japan’s April National Consumer Price Index (CPI) report is due on Friday.
Market Still Caught Between Risk And Policy
US President Donald Trump said on Tuesday that attacks on Iran could resume in “two or three days”, according to Bloomberg. On Monday, he said he had paused a planned resumption after a new proposal from Tehran.
An Iranian official said any large assault would be met “resolutely” and that Iran is “prepared to confront any military aggression”. Expectations of a longer conflict were seen as supportive for the US Dollar against the yen.
In Japan, traders played down stronger first-quarter GDP growth of 0.5%. The focus remained on intervention risk, despite the earlier growth reading.
Finance Minister Satsuki Katayama said on Monday that Japan is ready to act against excessive foreign exchange volatility at any time. She also said any action would be carried out in a way that avoids pushing up US Treasury yields.
Stronger Dollar Forces Clash With Intervention Risk
We are looking at a very different, yet familiar, situation today compared to what we saw around this time last year. Back in May 2025, the market was paralyzed by the twin threats of a potential US-Iran war and imminent intervention from Japanese authorities as USD/JPY tested the 159 level. That tension created a ceiling for the pair, keeping it pinned despite strong underlying dollar momentum.
As we know, Japanese officials followed through on their warnings in the summer of 2025, intervening heavily after the pair breached 160. That action pushed USD/JPY down sharply, but the relief for the yen was temporary because the fundamental story did not change. The massive interest rate differential between the US and Japan provided a constant tailwind for dollar bulls.
Today, with the pair creeping back up toward 157.50, the core dilemma for traders remains. The Federal Reserve’s rate is holding firm at 4.75% amid persistent services inflation, while the Bank of Japan has only managed a timid hike to 0.25%. This nearly 4.5% gap makes shorting the dollar against the yen a fundamentally difficult trade.
Therefore, traders should consider strategies that benefit from a sudden, large move in either direction, as the market is stretched between fundamentals and intervention risk. Vanilla spot trading is risky, as another intervention could trigger a sudden 500-pip drop with no warning. This environment is ideal for long volatility option plays.
We believe buying straddles or strangles is the most prudent approach for the coming weeks. This allows a trader to profit from a major price swing, whether it’s a surge toward 160 driven by carry trades or a sharp plunge to 152 triggered by the Ministry of Finance. The primary risk is a period of unexpected calm where the pair trades sideways, causing the options to lose value over time.
Recent data reinforces the upward pressure, with the latest US CPI showing inflation is proving stickier than expected at 3.4%, while Japan’s national CPI hovers around a more manageable 2.2%. The geopolitical landscape with Iran has stabilized into a tense stalemate, removing the safe-haven demand we saw last year. This leaves the interest rate differential as the main driver, with Japanese intervention serving as the primary, unpredictable risk.
