The US dollar gained strong buying support against the Japanese yen during the Asian session on Monday, with the exchange rate climbing back above the 162.00 level. It is currently trading around 162.08, up approximately 0.22%, recovering most of the losses from the previous Friday.
Several factors are collectively driving the yen's weakness. The escalating US-Iran conflict—marked by Iran's announcement to close the Strait of Hormuz, new US military strikes, and Iranian missile retaliation against US bases in the Gulf—poses a severe threat to the Japanese economy, which relies on the waterway for over 90% of its crude oil imports. Furthermore, the substantial interest rate differential of about 250-275 basis points between the US and Japan continues to fuel active carry trades. Additionally, geopolitical tensions are pushing oil prices higher, reinforcing inflation concerns and solidifying expectations for Federal Reserve interest rate hikes, which in turn supports the US dollar.
Geopolitical Dynamics: Unique Threat to Japan from Strait Tensions
The ongoing escalation of US-Iran conflict is applying unique pressure on the yen. Japan depends on the Strait of Hormuz for more than 90% of its crude oil imports, meaning any disruption to passage through this waterway directly threatens the nation's energy security and economic stability.
A series of events—Iran's announcement to close the Strait (though denied by the US), new US strikes on Iran, and Iranian missile retaliation against US bases in the Gulf—has plunged the global energy market into a state of high uncertainty.
For the yen, the transmission of this geopolitical risk is twofold. On one hand, heightened global risk aversion would typically benefit the yen, but the direct impact of Strait tensions on Japan's energy-import-dependent economy is currently offsetting the yen's safe-haven appeal. On the other hand, rising oil prices are boosting global inflation expectations, further cementing the market's view that the Federal Reserve will maintain a restrictive policy stance. This, in turn, exerts additional pressure on the yen through the interest rate differential channel.
Interest Rate Driver: Policy Divergence Sustains Yen Weakness
The significant interest rate gap between the US and Japan remains the core factor behind the yen's structural weakness.
The Federal Reserve currently maintains its benchmark rate in the 3.50%-3.75% target range. Although the Bank of Japan has raised its policy rate to 1.0%, its highest level since 1995, a gap of approximately 250-275 basis points persists between the two. This differential is sufficient to sustain active carry trades, where investors continue to borrow low-yielding yen to invest in higher-yielding US dollar assets.
Despite the Bank of Japan's June rate hike to a 31-year high of 1.0%, the yen's yield disadvantage has not been substantially improved relative to US rates.
A fundamental reversal in the yen's structural weakness is unlikely before a significant narrowing of the US-Japan interest rate gap occurs.
Dollar Strength: Safe-Haven Demand and Rate Hike Expectations
For the US dollar, escalating geopolitical risks are boosting its safe-haven appeal. The intensifying US-Iran conflict, uncertainty surrounding passage through the Strait of Hormuz, and inflation concerns reinforced by rising oil prices are collectively providing buying support for the dollar.
Markets are still pricing in at least one more Federal Reserve rate hike in 2026, an expectation that has become more entrenched against the backdrop of rising energy prices.
Key catalysts this week include the US June CPI data release on Tuesday and the first congressional testimony by the new Federal Reserve Chair. Should inflation data come in stronger than expected or the Chair deliver hawkish signals, the dollar could strengthen further, potentially pushing the USD/JPY pair toward the 163.00 level.
Risk Factor: Intervention Threat Caps Yen Short Positions
Despite facing multiple headwinds, the market remains highly alert to the possibility of renewed intervention by Japanese authorities. Japan's Ministry of Finance has already spent a record 11.73 trillion yen on intervention in April-May, and the current exchange rate level remains above the Ministry's known "pain threshold." This intervention risk is limiting the willingness of yen bears to establish large new short positions and is one reason why USD/JPY has failed to advance significantly further after hitting a four-decade high earlier this month.
While some FOMC members are scheduled to speak on Monday, the market's core focus remains on the US CPI data and the Fed Chair's testimony later in the week.
Outlook: Short-Term Strength with Intervention Capping Gains
In summary, USD/JPY maintains a short-term bullish bias, supported by a confluence of favorable factors. The unique shock of geopolitical risk to Japan's economy, the persistent US-Japan yield gap, and rising safe-haven demand for the dollar together form the logical chain for yen weakness. However, the 162.50-163.00 zone remains a significant resistance area, with the shadow of intervention risk likely curbing the aggressive intentions of yen sellers. If US CPI data surprises to the upside or the Fed Chair signals a hawkish stance, USD/JPY could test 163.00 or higher. Conversely, if inflation data softens or the Chair's remarks are cautious, combined with intervention fears, the pair could retreat to test the 161.50-162.00 area. In the current highly uncertain geopolitical environment, two-way volatility risks for USD/JPY cannot be ignored.
As of 12:06 Beijing Time, USD/JPY was quoted at 162.08/09.
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