For the first time in fifteen years, the United States and Japan reached across the Pacific to steady a currency that had drifted too far from equilibrium — a quiet but consequential act of alliance in an era when economic and diplomatic interests rarely align so cleanly. The Japanese yen, weakened to forty-year lows against the dollar, had begun to press painfully on ordinary life in an import-dependent nation, driving up the cost of food, energy, and goods. Washington and Tokyo's joint intervention sent the dollar falling sharply from above 163 yen to 156.34, a reminder that sovereign govern