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Yen Firms as Tokyo Signals 'Free Hand' for FX Action After BOJ's Cautious Hike

Finance Minister Satsuki Katayama said Japan can act under its U.S. accord if swings turn excessive.

A Japan Yen note is seen in this illustration photo taken June 1, 2017. REUTERS/Thomas White/Illustration
Banknotes of Japanese yen are seen in this illustration picture taken September 22, 2022. REUTERS/Florence Lo/Illustration
Yen and U.S. dollar banknotes are seen in this illustration taken March 19, 2025. REUTERS/Dado Ruvic/Illustration
Japan's newly-appointed Finance Minister Satsuki Katayama arrives at the prime minister's official residence in Tokyo, Japan October 21, 2025. REUTERS/Kim Kyung-Hoon

Overview

  • The yen strengthened to around 156.4 per dollar after officials delivered their strongest warnings yet against “one-sided” moves, trimming losses from last week’s slide.
  • Finance chief Satsuki Katayama and top FX diplomat Atsushi Mimura said authorities stand ready to take “appropriate actions,” with traders treating the remarks as a clear intervention threat.
  • Japan’s 10-year government bond yield climbed near 2.1%, a 27-year high, as investors priced fiscal risks from larger budgets and potential additional debt issuance.
  • Markets are watching the ¥160 level in dollar/yen as a possible trigger area, recalling roughly US$100 billion of yen-buying operations around similar levels last year.
  • The BOJ lifted rates to 0.75% but kept guidance cautious; analysts see scope for further hikes as soon as April, while negative real rates, carry trades and thin holiday liquidity keep the currency vulnerable.