World Bank Group President Paul Wolfowitz said Monday in Tokyo that Japan should play a larger role in promoting trade and investment in Africa, saying they were "more critical" to the continent than development aid.

"You may ask why should an economic superpower like Japan care about a struggling continent on the opposite side of the world.

"One answer is that Japan's leadership brings with it responsibilities. It is not just a regional power, it is also a global power," Wolfowitz said at a news conference at the Foreign Correspondents' Club of Japan.