Japanese Finance Minister Taro Aso said before the parliament on Monday that the government was ready to intervene in the foreign exchange market if the yen would raise further, adding that the yen's volatility was undesirable.

"For Japan, excessive volatility in yen moves that affect Japan's trade, economic and fiscal policies - be it yen rises or yen falls - is undesirable," Aso said.

"If such moves occur, Japan is ready to intervene in the market," he added.