Japan maintains monetary easing

The Bank of Japan announced a review of its longstanding monetary easing measures on Friday but said it would maintain them for the time being in the first policy decision under new governor Kazuo Ueda.

Analysts say the central bank's stimulus measures, which were supposed to deliver a vital boost to the Japanese economy, are looking increasingly unsustainable.

"The bank has decided to conduct a broad-perspective review of monetary policy, with a planned time frame of around one to one-and-a-half years," a BoJ statement issued after a two-day meeting said.

In the immediate term, the institution left its negative interest rate in place and did not adjust the band in which rates for 10-year government bonds fluctuate, as expected.

Former economics professor Ueda took over this month from Haruhiko Kuroda, the architect of the bank's signature ultra-loose strategy over the past decade.

On Friday, Ueda said the BoJ could still make tweaks to its easing policies during the review period.

"Necessary policy changes will be debated during each of the policy board meetings and if necessary, they will be implemented. That's our stance," he told reporters.