South Korea said it will take prompt measures if market moves turn excessive, after the won weakened toward its lowest level since 2009.
Finance Minister Koo Yun Cheol issued the pledge after a regular meeting with officials including the Bank of Korea governor, saying authorities were watching foreign-exchange markets with high vigilance.
Rising bond yields added to the pressure behind the warning, with officials framing intervention as a step to prevent market anxiety from spreading.
The statement underscores mounting concern over financial-market volatility as the currency slides toward a 17-year low.