The Japanese yen has weakened once more against the US dollar, approaching the levels that prompted authorities to intervene in the currency market at the end of April. In response, Japan's Finance Minister, Shunichi Suzuki, has reiterated that the government is prepared to act on foreign exchange movements as necessary.
On Wednesday, Suzuki stated, "As I have consistently stated, we are prepared to take necessary measures in the foreign exchange market at any time as needed."
In a related development, the Japanese cabinet has approved a supplementary budget of 3.1 trillion yen to fund measures aimed at helping households cope with inflationary pressures stemming from the situation in the Middle East. While this spending will be financed by issuing deficit-covering bonds, the total annual bond issuance will not increase because a portion of bonds originally planned for issuance by the end of June will be cancelled. Suzuki noted, "Since the total amount of bonds issued to the market will not increase, we believe we can implement this package without impacting the market."
The package includes establishing a new 2.5 trillion yen reserve fund to address rising commodity prices through subsidy measures. Although the government has not specified the fund's exact use, it is initially expected to focus on curbing gasoline price increases. Suzuki said, "We will explain this package carefully and hope to gain parliamentary approval as soon as possible."
Regarding developments in artificial intelligence, Suzuki welcomed Anthropic's decision to expand its "Glasswing Project" to include some Japanese companies, moving beyond its initial US-only focus. "Strengthening security is absolutely critical," Suzuki emphasized, adding, "As a financial market striving to be among the world's leading players, Japan must not fall behind other countries in this area."
Suzuki's remarks came as the yen approached 160 per US dollar, its weakest level since Japanese authorities intervened to support the currency in late April. At the time of writing, the USD/JPY rate had retreated slightly to 159.86.
Market Participants on Alert for Potential Intervention
Persistently high oil prices, fueled by stalled ceasefire negotiations between the US and Iran, are adding further pressure on the yen. Simultaneously, the substantial interest rate differential between the US and Japan continues to weigh heavily on the currency. Following the Bank of Japan's decision to hold rates steady in April, this yield gap remains a significant drag.
Traders are cautious about pushing the yen past the critical 160 level against the dollar, wary of potential intervention by Japanese authorities. Data released by Japan's Ministry of Finance last Friday showed that from April 28 to May 27, Japan spent 11.73 trillion yen (approximately $73.5 billion) to prop up the yen, a record for monthly intervention. At that time, the authorities' yen-buying operation briefly pushed the exchange rate to around 155 yen per dollar, but the yen has since gradually given back those gains.
Tsuyoshi Nakamura, an analyst at Gaitame.com Research Institute, commented, "As USD/JPY approaches the key 160 threshold, concerns about currency intervention will quickly intensify, triggering a psychological game." He added, "A test of the 160 level could happen at any time."
The USD/JPY rate hovering near 160 also creates greater uncertainty for traders regarding whether over $8 billion worth of forex options expiring by Thursday will become in-the-money.
Record Intervention Fails to Halt Yen's Slide
The effectiveness of Japan's massive intervention in late April appears to have been short-lived, with the yen falling back near the 160 warning line after a brief rebound. Why has intervention struggled to reverse the yen's decline? Fundamentally, the current downward pressure is not driven by speculative attacks but by the sustained convergence of three deeper structural factors.
First, the vast US-Japan interest rate gap remains a formidable obstacle. Since the outbreak of conflict in the Middle East, expectations for Federal Reserve policy have undergone a dramatic reversal—from widespread bets on rate cuts at the start of the year to traders now pricing in the possibility of a hike by the end of 2026. In contrast, while the Bank of Japan is slowly normalizing monetary policy, its policy rate currently stands at just 0.75%, with a potential hike to 1.0% pending confirmation at its June meeting. Analysts at StoneX point out that even if the BOJ hikes rates as expected, the yield gap between the US and Japan remains at historically wide levels, which is the core macro factor pressuring the yen.
Second, the energy shock has exposed Japan's structural vulnerabilities. As one of the world's largest energy importers, Japan is heavily reliant on Middle Eastern crude. After the US-Iran conflict disrupted transport through the Strait of Hormuz, Japan's crude oil imports plummeted nearly 66% year-on-year in April to 850,000 barrels per day, the lowest level since 1967. Soaring oil prices combined with a weak yen create a "double whammy" of imported inflation—with the corporate goods price index rising 4.9% year-on-year and import prices surging 17.5%. This "cost-push inflation" does not boost consumption but instead erodes corporate profits and household purchasing power.
Third, the Bank of Japan's perceived slow response is testing market patience. With inflation having exceeded the 2% target for many consecutive months, the central bank's pace of rate hikes is widely seen as "too cautious." Former BOJ policy board member Makoto Sakurai issued a blunt warning in a May 29 interview: "If they don't raise rates in June, policy will fall behind the curve. This meeting is extremely important." He added that missing this opportunity could lead to the next hike being postponed indefinitely due to high uncertainty surrounding the Middle East situation.
US Treasury Secretary Janet Yellen has also signaled support for a BOJ rate hike during her recent visit to Tokyo. Sakurai noted, "Considering Japan-US diplomatic relations, the government likely has no choice but to accept a rate hike."
While Japan still holds substantial foreign exchange reserves, depleting a large portion or all of its overseas assets is not a viable option, especially as it could negatively impact the value of US Treasury bonds. This means Japan's current actions urgently require US cooperation. Japan's currency intervention from late April to early May has already drawn strong dissatisfaction from the US. Yellen has repeatedly publicly criticized Japan's intervention approach, explicitly advocating that Japan should stabilize the yen through interest rate hikes rather than currency intervention.
The core US concern is that Japan's intervention funds primarily come from selling US Treasuries, and sustained selling could further push up US bond yields, exacerbating volatility in American financial markets. With Middle East conflicts pushing oil prices higher and intensifying global inflation concerns, US Treasury yields are already on an upward trajectory; Japan's bond sales would only add fuel to the fire, heightening US anxiety. As the US fiscal deficit widens and Treasury issuance surges, the US government is unlikely to tolerate Japanese policy moves that indirectly push up already elevated US bond yields.
Takehiro Ueno, senior economist at NLI Research Institute, stated, "US understanding is crucial for sustaining the effectiveness of any intervention." He added that if Washington expresses opposition to such operations, "it could trigger speculative yen selling."
Bank of Japan Cornered as Market Focus Shifts to Ueda's Remarks
With intervention proving insufficient to rescue the weak yen, traders' attention is shifting from the Finance Ministry's "ammunition" to the Bank of Japan. The BOJ's interest rate decision on June 16 is becoming the critical juncture that will determine the yen's short-term fate.
When asked if monetary policy would be the key factor in correcting yen weakness, Finance Minister Suzuki declined to comment on specific exchange rate levels but stated she and BOJ Governor Kazuo Ueda "agree on many points."
Governor Ueda is scheduled to speak on Wednesday afternoon. This will be his last scheduled public appearance before the BOJ's policy board meets for its next rate decision on June 16. Investors are trying to glean signals from Ueda's remarks about what action the central bank might take this month.
The overnight index swap (OIS) market currently indicates an approximately 84% probability of a BOJ rate hike this month. Kumiko Ishikawa, senior analyst at Sony Financial Group, said, "The market has not fully priced in a June rate hike, so if Ueda's remarks prompt the market to further factor in hike expectations, that would provide some support for the yen." However, she cautioned, "If the market interprets his remarks as dovish, USD/JPY could rise rapidly, so the market is closely watching this speech."
This month's BOJ meeting is shaping up to be one of the most complex policy balancing acts in recent years. Governor Ueda faces at least three intertwined challenges.
The first challenge: to hike or not to hike. Inflation data is sending mixed signals. Tokyo's core CPI rose just 1.3% year-on-year in May, below expectations and the slowest pace in four years. However, Makoto Sakurai noted this slowdown was influenced by temporary "technical factors" (education and water supply subsidies), and core inflation is likely to re-accelerate to over 3% in the autumn or later. Against this complex backdrop of "short-term softness, medium-term recovery," the BOJ faces a difficult trade-off between "waiting for clearer signals" and "preventing a fall behind the curve."
Analysts point out that persistent domestic inflation pressure, a weak yen exacerbating imported inflation, and the global environment of monetary tightening provide logical support for a BOJ rate hike this month. However, the central bank has multiple concerns regarding a hike decision. First, the domestic economic recovery is fragile, and a rate hike could easily further suppress weak domestic demand and corporate investment. Second, Japan's government debt is massive, and a rate hike would significantly increase fiscal interest payment burdens, threatening debt stability. Third, after years of low rates, financial institutions hold heavy government bond positions; a rate hike could trigger asset valuation losses, impacting financial system stability, while also requiring careful balancing with the pace of expansionary fiscal policy.
Furthermore, Japanese political factors could add uncertainty to policy tightening.
J.P. Morgan Private Bank notes that under the dual pressures of high energy prices and fiscal expansion, the BOJ may need to maintain a relatively accommodative policy stance to mitigate potential demand contraction.
The second challenge: the bond purchase program. The recent surge in Japanese government bond (JGB) yields has heightened market tension. The 10-year JGB yield has risen to 2.8%, a high not seen since 1996; the 30-year yield briefly touched a record peak of 4.2%. Rapidly rising yields directly increase the government's debt financing costs—a significant concern for a country with government debt around 250% of GDP.
Sources indicate the BOJ is internally discussing whether to pause further reductions in its JGB purchase scale for the 2027 fiscal year to avoid losing control of yields. Sakurai commented that "halting the slowdown in bond purchases is also acceptable."
The third challenge: the exchange rate floor. The 160 level is widely seen by the market as the Finance Ministry's "line in the sand." Marito Ueda, managing director at SBI FX Trade, stated bluntly, "USD/JPY is likely to break 160, at which point the Finance Ministry will have to intervene again."
However, intervention "ammunition" is not unlimited. While the nearly $74 billion spent recently is still only a portion of Japan's approximately $1.17 trillion in foreign reserves, large-scale sales of US Treasuries could provoke US displeasure. More importantly, as summarized by Masahiko Loo, senior fixed income strategist at State Street, "Intervention only buys time, it cannot change the situation—the real shift must come from the Bank of Japan."
Short Sellers Increase Bets and Risks of a "False Breakout"
During this policy decision vacuum, speculative funds are repositioning. Data from the Commodity Futures Trading Commission (CFTC) for the week ending May 26 shows leveraged funds and asset managers have increased their net short yen positions to the highest level since July 2024. This indicates the market is voting with its positions—betting that the BOJ's actions in June will be insufficient to reverse the yen's weak trend.
Technically, the 160 level has become a key battleground. Analysts note that USD/JPY's plunge from 160.72 to 155.50 on April 30 provided the market with a clear "policy reaction function"—that authorities will intervene decisively near 160. However, this information itself could be used against the market: some traders are considering positioning in advance, betting the next round of intervention might come when USD/JPY rises to around 162.
David Scutt, an analyst at StoneX, noted in a quarterly outlook report that if USD/JPY convincingly breaks above the 2024 high of 161.95, "there is little in the way of near-term resistance, with the next technical reference point directly targeting the September 1978 low of 177.05."
If the BOJ chooses to hike rates by 25 basis points to 1.00% while signaling a "pause in balance sheet reduction," this would be interpreted by the market as a "hawkish-dovish" combination—acknowledging inflation pressures require a policy response but unwilling to exacerbate bond market turmoil by further tightening liquidity. This combination might provide limited support for the yen, as the US-Japan yield gap would remain significant, and the market might interpret the "pause in balance sheet reduction" as central bank concern over the economic outlook.
If the BOJ unexpectedly stands pat, the market reaction could be more severe. Sakurai warned that not hiking could lead to further yen weakening, "and that would anger the US." Considering Yellen's explicit stance that Japan should address yen weakness through rate hikes, not intervention, the BOJ's inaction in June could trigger a new wave of large-scale selling, pushing USD/JPY toward 165 or even higher.
Furthermore, geopolitical uncertainty remains the largest exogenous variable. The direction of energy prices will continue to affect the yen exchange rate through two channels: trade terms and inflation expectations.
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