Washington Sells Euros to Join Japan’s $36 B Yen Rescue, First Bilateral Yen-Buy Since 1998

Currency interventions that enlist Washington are rare; the last bilateral yen-buy came in June 1998 during the Asian crisis, and the Plaza Accord of 1985 (when G5 powers forced a 40 % dollar drop in two years) shows how joint action can reset global capital flows for a generation. Today’s move signals deeper structural shifts: the post-2008 world of near-zero Japanese rates, recycled Japanese savings suppressing U.S. yields, and a vast yen carry trade is eroding as Japan edges toward 2-3 % policy rates and the U.S. confronts heavier Treasury issuance. By swapping euros—not dollars—for yen and leaning on the Fed’s FIMA window, Washington tried to defend its own bond market as much as an ally’s currency, exposing the tension between “strong-dollar” rhetoric and the need to keep foreign buyers engaged. Over a 100-year horizon this episode may mark the beginning of the end of Japan’s role as the safety valve for U.S. deficits; if Japan ultimately repatriates capital and the FIMA backstop replaces open-market bond buying, the cost of U.S. borrowing will be set less by Asian savers and more by domestic balance-sheets, altering the architecture forged after Bretton Woods (1944) and reinforced during the 1980s debt super-cycle.