The Japanese yen weakened past 160 per dollar on Monday, trading in a 159.85-160.20 range, marking the first breach of that level since the joint U.S.-Japan currency intervention that briefly pushed the currency back from a 40-year low near 164. The move came as the yield on the benchmark 10-year Japanese government bond touched 2.95%, its highest level since September 1996, according to Nikkei Asia.
The renewed selling pressure on the yen followed hawkish signals from Federal Reserve Chair Kevin Warsh at the Jackson Hole symposium on August 28. Markets interpreted Warsh's remarks as leaving the door open for further interest-rate hikes, with the probability of a September Fed increase now priced above 55%. The stronger-for-longer U.S. rate outlook widened the interest-rate differential between the Fed and the Bank of Japan, which has been far more cautious on tightening.
The yen's slide back through 160 underscores the limited durability of the record intervention campaign that Japan launched in late July with U.S. backing. Data released on August 28 showed that Japan spent a record $98.7 billion on yen-buying operations over the past month alone, bringing total intervention expenditure in 2026 to approximately $170 billion, according to figures reported by the Wall Street Journal. Treasury Secretary Scott Bessent, whose involvement in the intervention was confirmed by a notepad seen at a July 31 cabinet meeting noting plans to buy $5 billion to $10 billion of yen, described the currency moves as "substantially contained" and said he awaited the Bank of Japan "doing the right thing" ahead of the G20 finance ministers' meeting.
Analysts at Citi have argued that yen weakness is structurally difficult to reverse because foreign investors selling yen to hedge currency risk when investing in Japan's booming stock market create persistent downward pressure. The fact that the yen has now given up many of the intervention's initial gains — which had briefly pushed it to the 159-160 range from the 164 low — suggests that market forces continue to outweigh government action.
The jump in JGB yields adds another dimension to Japan's policy dilemma. At 2.95%, the 10-year yield is at its highest in nearly three decades, reflecting both global rate pressure and domestic expectations that the BOJ will continue its own gradual tightening cycle. BOJ Deputy Governor Himino spoke on August 28 about inflation risks, stopping short of signaling an imminent rate hike but reinforcing the view that the central bank is moving toward further normalization. Rising yields on government bonds also create fiscal pressure, as Japan's enormous public debt — the largest among developed nations at roughly 260% of GDP — becomes more expensive to service.
For global markets, the combination of a weakening yen and rising Japanese yields carries cross-border implications. A weaker yen makes Japanese exports more competitive but raises import costs, particularly for energy. Higher JGB yields can pull capital away from other sovereign bond markets, contributing to the broader global repricing of interest-rate risk that has been a defining theme of 2026.
Sources
- Nikkei Asia: [Japan bond yields rise to 2.95% and yen weakens after Jackson Hole](https://asia.nikkei.com/business/markets/japan-bond-yields-rise-to-2.95-and-yen-weakens-after-jackson-hole), August 31, 2026.
- HeadlinesBriefing (WSJ): [Japan Spent $98.7 Billion on Yen Intervention With U.S. Backing](https://headlinesbriefing.com/market/wsj-markets/japan-spent-987-billion-on-yen-intervention-with-us-backing-75f0e016), August 28, 2026.
