Japan's current account posted its biggest surplus in over three years in February, as the anemic yen boosted income from abroad while a dip in global crude oil prices drove down imports, the government said Wednesday.

The surplus stood at ¥1.44 trillion, the largest since the balance of ¥1.62 trillion logged in September 2011, six months after the economic shock of that year's quake, tsunami and nuclear triple whammy, the Finance Ministry said in a preliminary report.

It was the first time since April 2013 that the current account surplus topped ¥1 trillion, and marked the eighth straight monthly surplus, a ministry official said.