US-Japan Yen Intervention Boosts Won, Eyes Return to 1,300 Range

A rare joint intervention by the US and Japan to support the yen has given the Korean won a significant boost, potentially pushing it back into the 1,300-won-per-dollar range.

The US Treasury bought yen in coordination with Japan's Finance Ministry, marking the first joint intervention since 1998. This move had an immediate impact on the won, which investors often trade as a proxy for the yen due to their tendency to move together.

South Korean authorities have not announced any direct participation in the intervention but have confirmed close consultations with Washington and Tokyo, sparking speculation about de facto trilateral currency coordination. This cooperation has helped stabilize the won, which strengthened sharply on Friday as the dollar tumbled against the yen.

Market analysts now see the won potentially breaking into the 1,300-won range for the first time in nearly a year. However, a rapid strengthening of the yen could trigger an unwinding of yen carry trades, leading to broader position cuts across risk assets, including the Korean won.