Japan's Finance Minister Satsuki Katayama has reiterated that authorities are prepared to take "appropriate and bold action" to support the yen amid its recent slide to levels not seen in nearly four decades. The yen fell below 163 against the US dollar—a threshold last breached in 1986—following renewed tensions in the US-Iran conflict that have driven up oil prices and intensified market volatility.
Speaking at a press conference on July 22, Katayama emphasized that Japan’s policy on potential intervention remains unchanged, stating that officials would act if necessary. She described the geopolitical situation as having taken "a sudden turn for the worse," creating a "very difficult environment" for the markets. However, traders noted that her remarks had minimal effect on the dollar-yen exchange rate, with many seeing the statement as a test of Japan’s willingness to intervene rather than a definitive signal.
Market participants attribute the yen’s weakness partly to the spike in oil prices resulting from escalating hostilities between the US, Iran, and neighboring Gulf countries. This increase has fueled speculation that the US Federal Reserve may raise interest rates sooner than anticipated, bolstering the dollar against the yen and other currencies. Analysts also point to Japan’s vulnerability due to its heavy reliance on energy and food imports, which have deteriorated the country's terms of trade amid the conflict.
Adding to concerns, recent data showed Japan’s trade deficit unexpectedly widened to $2.5 billion in the previous month—more than double the forecast—highlighting the strain on the country’s economy from geopolitical instability. This has compounded the yen’s decline and underscored structural challenges within Japan’s external balance.
Despite strong verbal warnings from Katayama and an extensive market intervention between late April and late May—involving the expenditure of approximately ¥11.73 trillion ($71.9 billion)—the yen’s losses have largely persisted. The earlier intervention briefly strengthened the currency, but those gains were fully reversed by early July. The yen’s fall through the 162 level, previously viewed as a symbolic “line in the sand” for intervention, surprised some observers. Since then, market analysts have debated where Japanese authorities might now set intervention thresholds.
Some market experts remain skeptical about further intervention given the high associated costs and the limited impact past efforts have had. Marito Ueda, president of SBI FX Trade, suggested that repeated government warnings have been largely discounted by investors. At the same time, policy measures such as Japan’s recently approved economic and fiscal plan aim to reinforce confidence by affirming the Bank of Japan’s independence and promoting domestic investment.
Looking ahead, strategists warn that ongoing Middle East tensions could continue to provide upward momentum for the dollar against the yen. Rodrigo Catril, senior foreign-exchange strategist at National Australia Bank, noted that if US-Iran hostilities worsen before improving, the dollar-yen rate may rise toward 165 rather than retreat below recent lows. As the geopolitical landscape evolves, Japan faces the challenge of managing currency stability amid external shocks and domestic policy constraints.