Japan's Billions in Yen Interventions Hit a Wall

Japan's Ministry of Finance deployed substantial foreign reserves to buy yen in 2026, yet saw minimal lasting impact as the currency weakened to 159.45 per dollar in January—an 18-month low. The failure reflects a structural reality: currency intervention cannot offset a rate gap. With Japanese rates near zero and US, European, and UK rates materially higher, capital flows outward regardless of official support. Only a credible shift in monetary policy can close that differential.