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Japan’s FX Chief Issues Strong Warning Amid Yen Strength

Mar 30, 2026 00:21 UTC

Atsushi Mimura Photographer: Shoko Takayasu/Bloomberg.

  • Atsushi Mimura, Japan’s vice finance minister for international affairs, warned of potential government intervention in forex markets.
  • The yen approached the 160 level against the U.S. dollar, prompting concerns about speculative activity.
  • Mimura cited growing concerns about speculation in both the foreign exchange and crude oil futures markets.
  • The government has previously hinted at possible market intervention to stabilize the yen.
  • Mimura’s remarks signal a readiness to take decisive action if market conditions persist.

Japan’s vice finance minister for international affairs, Atsushi Mimura, delivered a firm warning to market speculators Monday, indicating the government may take decisive action if current conditions in the foreign exchange market continue. Mimura’s remarks came as the yen approached the 160 level against the U.S. dollar, a threshold that has raised concerns among policymakers. “We’re hearing increasing concern that speculative activity is picking up not just in the crude oil futures market, but also in the foreign exchange market,” Mimura said during a press briefing. The comments reflect growing unease over the yen’s rapid appreciation, which has been driven by shifting global risk sentiment and speculation about potential Bank of Japan policy adjustments. Authorities have been closely monitoring the yen’s trajectory, with officials previously hinting at the possibility of market intervention to stabilize the currency. While no immediate action has been announced, Mimura’s statement underscores the government’s readiness to act if necessary to prevent excessive volatility. The warning is likely to heighten scrutiny of speculative positions in both the yen and crude oil markets, as investors assess the potential for policy-driven market corrections.

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