• Japan's Finance Minister Satsuki Katayama warns of decisive steps against excessive yen volatility.
  • Tokyo signals readiness to intervene as yen weakness raises import costs and inflation concerns.
  • Markets watch for actual intervention after recent official activity near key USD/JPY levels.

Maximum Vigilance on Yen Moves

Japan’s finance minister, Satsuki Katayama, reinforced on Thursday that Tokyo is prepared to take “decisive steps” against disorderly foreign-exchange moves, as the yen’s rapid depreciation against the dollar draws heightened scrutiny. “We are watching the market with maximum vigilance,” Katayama said at a press conference, declining to specify intervention levels but stressing that authorities will act if speculative activity intensifies.

The remarks come as USD/JPY hovers around 151, a level that has historically triggered official concern. According to people familiar with the matter, Japanese officials have already conducted informal rate checks with banks, a precursor to intervention. The yen’s slide, driven by wide interest-rate differentials between Japan and the US, has pushed import costs higher and squeezed household purchasing power, complicating the Bank of Japan’s policy normalization plans.

Coordination and Market Impact

Katayama’s warning echoes recent statements from top currency diplomat Masato Kanda, who said authorities are in close contact with international peers, including the US, under a bilateral understanding on exchange-rate stability. Japan has a track record of intervening when moves are deemed excessive, most notably in 2022 when it spent about ¥9 trillion ($60 billion) to support the yen.

Traders are now pricing in a higher risk of intervention, with options markets showing elevated implied volatility. “The government is trying to cap speculative momentum rather than chase every move,” said a Tokyo-based currency strategist. “Without a deal between the BOJ and the Fed on policy direction, we could see repeated rounds of tension.”

Attempts to reach the finance ministry for further comment were unsuccessful. Critics argue that unilateral intervention offers only temporary relief if fundamental drivers persist, but officials remain focused on preventing a disorderly adjustment that could harm both domestic consumers and global trade flows.