Japan urged China on Friday to tackle structural challenges to deal with growing uncertainty about its economic outlook at a meeting of finance chiefs from the Group of 20 economies, Japanese officials said.

Finance Minister Taro Aso told reporters he urged China to address issues such as excess investment, the social security system and nonperforming loans in the banking sector during the first day of the G-20 talks in Ankara.

China agreed on the need for such reforms, according to one official with the Japanese delegation.