Yen Surges on Tokyo Warning as Oil Prices Rebound Amid Middle East Tensions

The yen surged on Monday after Japan's Vice Finance Minister Atsushi Mimura sharpened Tokyo's intervention warning, saying markets should take the coordinated Japan-US message on Yen weakness 'at face value.'

This move was notable because Yen weakness had persisted even after the BoJ raised its policy rate to 1.25% earlier this month. Monetary normalization is narrowing the U.S.-Japan rate gap only gradually, while U.S. yields remain exceptionally high.

The warning also carried more weight because Tokyo and Washington have maintained a shared concern over Yen weakness, with Finance Minister Satsuki Katayama and U.S. Treasury Secretary Scott Bessent reaffirming that Yen undervaluation was an issue in talks on Friday.