FX Intervention Explained: Why Japan and Korea Buy Currencies

The yen just flirted with levels most traders on today’s desks have never seen. USD/JPY briefly pushed to roughly 164 in late July, a multi‑decade extreme that had Tokyo hinting at action. Finance Minister Satsuki Katayama said Japan would “take decisive action appropriately at any time,” a not‑so‑subtle nudge to speculators Investing.com (reporting Reuters).

This is not just a Japan story. South Korea has been battling a soft won and imported inflation. The Bank of Korea lifted its base rate by 25 bps to 2.75 percent on July 16 with stabilising the won explicitly on the docket Bank of Korea.

Put simply: both governments are buying time against a strong dollar and shaky risk sentiment. Let’s walk through why they step in, how the machinery works, and what to watch next.

Japan’s yen and Korea’s won are under pressure for different mixes of reasons, but the through‑line is the same: a wide rate gap with the US, sticky inflation concerns at home, and markets testing where officials will draw the line. In July, USD/JPY printed as high as about 163.99, the weakest yen since the late 1980s The Japan Times (citing Bloomberg). Earlier that week it traded near 163.24 in New York, underscoring how quickly momentum can build Investing.com (reporting Reuters).

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