U.S., Japan confirm coordinated yen intervention, signal readiness for more CNBCUS Treasury’s Firepower for Yen Support May Be Limited, JPM Says bloomberg.comTreasury Warns Banks It Might Intervene in Dollar-Yen Exchange Rate WSJEXCLUSIVE Japan to announce Tokyo, Washington took joint action on yen, sources say ReutersU.S. and Japan Coordinated to Help Stabilize the Yen The New York Times