Japan spent a record $73.5 billion on yen intervention in one month, but the currency slid back to 160 per dollar, raising risks for carry-trade-fueled

Dollar-buying fuels speculation over Tokyo's use of $1.3tn war chest

Japan signals readiness to step into currency markets if the yen weakens further. The currency is nearing a critical 160 per dollar mark. This comes after significant yen-buying…