Mimura's framing of the joint intervention as the culmination of a longstanding currency alliance reinforces the narrative of durable, structural cooperation rather than a one-off response, which should support confidence in continued coordinated action if the yen weakens again. That should reassure traders that Tokyo isn't relying on a single, capped mechanism to defend the currency, and that its toolkit extends beyond what the facility alone can provide. ---Japan's top currency official says the yen intervention marks the peak of a long US alliance, and insists Tokyo's firepower isn't capped by any single tool. He said only that Japan would continue to work closely with the central bank, a signal of continued coordination between currency and monetary policy without further detail on what that might involve. The comments follow confirmation from both Washington and Tokyo that Friday's coordinated yen-buying intervention, the first joint action of its kind since 2011, was aimed at countering disorderly moves in the currency after it fell to 40-year lows against the dollar.