Asian equities faced a mixed session on Tuesday as a fresh surge in global bond yields collided with higher oil prices, leaving Japan's Nikkei 225 and South Korea's KOSPI navigating a complex landscape of inflation and interest-rate risks.
The Nikkei 225 dropped about 1% to 65,647 in morning trading, with semiconductor shares leading the decline. Japan's benchmark 10-year government bond yield touched 3% for the first time since 1996, a level that pressured technology valuations. Tokyo Electron fell roughly 4.1%, Lasertec lost 3.1%, and Renesas Electronics declined 3%.
The yen remained near 160 per dollar, adding another layer of complexity. Markets are now pricing in about a 73% probability of a Bank of Japan rate hike this month, while US Treasury Secretary Scott Bessent has publicly suggested that Japan needs further monetary tightening. For the Nikkei, the combination of higher domestic yields and a weak yen is particularly uncomfortable, as it squeezes expensive tech stocks while raising import costs just as crude prices climb again.
In contrast, South Korea's KOSPI staged a sharp recovery. The index initially fell 1.24% shortly after the open, with Samsung Electronics dropping more than 2% and SK Hynix sliding about 1.2%. However, by late morning, Samsung had nearly erased its decline, and SK Hynix reversed to a gain of about 2%, helping the KOSPI trade just 0.2% lower around 6,809. POSCO Holdings also rose more than 2%.
The resilience in Seoul comes against an unusually strong export backdrop. South Korean exports surged 68.7% year-on-year in August to $98.26 billion, with semiconductor exports almost tripling to a record $46.65 billion as AI-related memory demand remained exceptionally strong. That gives the KOSPI a fundamental cushion even as global rates and geopolitical tensions weigh on sentiment. For more on the chip trade, see our recent analysis on SK Hynix's margin pressures.
The broader regional picture remained cautious. MSCI's Asia-Pacific gauge slipped about 0.2%, while Australia's S&P/ASX 200 fell around 0.4% and Hang Seng futures declined by a similar amount. Brent crude climbed above $91 as the US and Iran exchanged strikes for the first time in about a month, reducing hopes that shipping through the Strait of Hormuz will normalise quickly. Rising energy costs are again feeding into inflation expectations, a dynamic that has also pressured US markets, as seen in the recent Dow's slide on oil and rate worries.
At the same time, the US 10-year Treasury yield has climbed towards 4.78%, its highest since early 2025, after Fed Chair Kevin Warsh used Jackson Hole to reinforce his willingness to tighten policy if inflation fails to ease. Chris Larkin of E*Trade told Bloomberg that unexpectedly strong US labour data this week could now be treated negatively by markets because it would strengthen the case for a September rate increase.
For investors, the key takeaway is that the interplay between bond yields, oil prices, and central bank policy remains the dominant driver across Asian markets. While South Korea's export strength provides some support, the Nikkei's vulnerability to rising JGB yields and a weak yen is a reminder of the delicate balance. As always, the situation remains fluid, and further volatility is likely.
This article is for informational purposes only and does not constitute financial advice.
