A monetary easing in Japan held the yen down around three-year lows Wednesday. The Japanese central bank said it would step up its purchases of government bonds and raise its target for commercial banks' current accounts deposit in an effort to awaken the country from its third recession in 10 years. The dollar traded as high as 128.44 yen but fell back to 128.20, while the euro went as high as 115.96 yen before slipping to 115.