Japan is stepping up pressure on China to appreciate its currency as trade tensions between the two countries intensify.
'The yuan's exchange rates have been almost fixed and thus do not reflect a real economic picture,' Japanese Trade Minister Takeo Hiranuma said yesterday in Tokyo.
He said China was expected to face calls to boost the value of the yuan from Japan and other countries because China was now a member of the World Trade Organisation.
Japan recently intervened to curb the resurgence of the yen. The Bank of Japan is believed to have sold yen on three days in the past two weeks to keep it from rising further and wiping out exporters' revenues.
Japan's latest criticism of China is seen as an attempt to fight back following its humiliating sovereign credit downgrade on Friday, which narrows its opportunities to fight recession.
Friday's downgrade by Moody's Investors Service to A2 - the same rating as Greece and Latvia - makes Japan even more reliant on exports to pull itself out of economic malaise.