Japan’s Finance Minister Satsuki Katayama isn’t being subtle. She wants currency speculators to know that Tokyo and Washington are on the same page, and that the playbook for defending the yen hasn’t changed.
Katayama reiterated that Japanese authorities remain prepared for “decisive action” against speculative movements affecting the yen, stressing the importance of ongoing dialogue with US counterparts.
What’s actually on the table
The foundation for this coordination traces back to a Japan-US joint statement from September 2025 that explicitly permits intervention against “disorderly” currency moves. That agreement gave both countries diplomatic cover to act in tandem when forex markets get out of hand.
The relationship was reinforced on May 12, 2026, when Katayama met with US Treasury Secretary Scott Bessent in Tokyo. The two officials confirmed their alignment on currency market coordination, a meeting that came against a backdrop of yen weakness driven by external factors, including developments in the Middle East.
