"I won't comment on recent currency moves. But it's desirable for exchange rates to move stably reflecting fundamentals," Kanda, who is vice finance minister for international affairs, told reporters on the sidelines of the G20 finance leaders' meeting in Sao Paulo.

"We're watching currency moves with a strong sense of urgency, and ready to respond appropriately if we see excessively volatile moves," he said.

(Reporting by Leika Kihara)