Japan spent $74 billion propping up the yen. Investors say the real battle is with the Fed  CNBCJapan’s FX Chief Says Past Yen Intervention Has Shown Impact  Bloomberg.comDollar pushes higher, yen sinks to 40-year low  Yahoo FinanceTokyo keeps powder dry as ‘line in the sand’ on yen shifts  ReutersJapan’s World Cup exit isn’t its biggest problem  KITCO