The rollover of the insurance was approved by parliament on Wednesday and takes effect from April for one year, the official said.

While the rollover provides insurance cover for imports that Japanese shippers cannot otherwise obtain, refiners are unlikely to load Iranian cargoes from April unless they get a waiver from the United States on sanctions re-imposed on Iran last year.

Japanese refiners have been pushing the government to seek an extension of the U.S. sanctions waivers after an initial 180-day exemption period expires in early May.