Rare Japan-South Korea joint intervention shakes up yen and won
Japan and South Korea carried out a rare joint intervention in currency markets, triggering sharp moves in the yen and the won. The two currencies are so tightly coupled that a joint intervention could double the impact of acting alone.

Japan and South Korea carried out a rare joint intervention in currency markets, a move that triggered sharp swings in both the yen and the won. Such simultaneous interventions between the two countries are uncommon.
Analysts note that the yen and won are so tightly coupled that a joint intervention can double the impact compared with either country acting alone, amplifying the effect on markets.
The move comes at a time when regional currencies have been under pressure and central banks have sought to stabilize exchange rates. Markets are watching closely to see whether the two countries will continue coordinating further action.
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