Tokyo, 31 July 2026 – Rare coordinated action by Japan and South Korea shook foreign-exchange markets, lifting the yen and won and forcing traders to reassess the willingness of Asian authorities to resist disorderly currency weakness. The episode marked an unusual level of policy alignment between two major regional economies.
Japan has faced persistent pressure from a weak yen, which raises import costs and complicates monetary policy. South Korea confronts similar concerns when won depreciation increases the cost of energy and overseas inputs. Acting in close proximity amplified the market impact because traders could no longer treat each currency as a separate policy story.
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