The Japanese yen hovered near the 160 threshold against the U.S. dollar on June 4-5, 2026, despite Japan's unprecedented currency interventions and Prime Minister's pledge to defend the currency. New data reveals foreign reserves plummeted 5.6% to $1.31 trillion in May - the largest monthly decline on record - as authorities spent heavily to stabilize the yen amid rising oil prices and global risk aversion. Reuters+2
💰 Intervention Scale
Japan's currency defense measures show deepening costs:
- April-May: 11.73 trillion yen ($74 billion) spent
- May foreign reserves dropped by $77.11 billion
- Securities including U.S. Treasuries accounted for most decline
The interventions initially lifted the yen from 160.7 to 155, but effects proved temporary. Asahi Shimbun+2
📉 Market Impact
Persistent weakness despite government actions:
- Yen retreated to 160/dollar by June 3-5
- Traders remain alert for further intervention
- Currency is worst performer in G10 this year
Import costs and household budgets face growing strain. Reuters+2
🌐 Geopolitical Factors
External pressures compounding Japan's challenges:
- Gulf conflicts boosting oil prices and dollar demand
- US-Israel ceasefire uncertainty affecting risk appetite
- Nikkei volatility amid currency fluctuations
These factors undermine intervention effectiveness. Reuters+2
🏦 Policy Challenges
Mounting dilemmas for Japanese officials:
- Record reserve depletion raises sustainability questions
- Speculative trading pressure persists
- Balancing economic strengthening with market stabilization
Prime Minister emphasizes economic reforms alongside currency defense. The Wall Street Journal+2
forex marketScott BessentSatsuki Katayamayen-dollar exchangeJapan Ministry of Finance