Asian equities drop as Iran tensions rattle oil and bond markets

The extent of the selloff in both Japanese and South Korean markets indicates that investors are treating the latest US-Iran escalation as a structural change rather than a temporary event, with the impact visible across stocks, crude and government bond yields simultaneously. Analysts are linking the pressure on growth and technology stocks specifically to the surge in bond yields, noting that this particular yield increase reflects worries about fiscal risk rather than the sort of yield climb that usually comes with robust economic expansion. In Japan, additional pressure from rising expectations of BOJ rate increases is adding to the strain on JGB yields, producing a dual challenge for equities stemming from both global risk aversion and domestic monetary tightening bets. The level of foreign selling in Korea suggests international investors are viewing this as a broad risk-off shift rather than a company-specific issue, a pattern that is likely to continue as long as the Iran conflict shows no indications of easing.

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• US strikes Iranian tankers for first time under new deterrence policy
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Asian markets are factoring in a more prolonged and expensive Iran conflict, and bond yields are conveying much of the message.

The Nikkei dropped roughly 3% to about 64,250, while the broader Topix fell around 2.4% to near 4,080, heading for an end to a nine-session rally. Market participants said the decline reflected broad-based positioning ahead of higher oil prices. Crude extended its previous session's jump, climbing about 1% in early trade after the US and Iran traded strikes overnight, reducing hopes for a rapid de-escalation.

SoftBank Group slid over 6%, while chip-related stocks Tokyo Electron and Advantest lost approximately 2.8% and around 4% respectively. Analysts cited rising bond yields as the main factor weighing on growth names, stating the current yield increase is being interpreted as a fiscal risk signal rather than an indicator of economic strength. Japan's 10-year government bond yield rose to around 3%, its highest in almost three decades, while the two-year yield hit about 1.8%, a level not seen since 1995, driven by growing expectations of speedier BOJ rate increases.

South Korean equities fell more than 3% as the same tensions pushed up bond yields. Analysts noted increased market sensitivity to oil prices and yields. South Korea's August consumer inflation picked up on a low base effect from a year earlier but missed market forecasts. Samsung Electronics, SK Hynix and LG New Energy each dropped more than 3%, while Hyundai Motor and Kia fell over 5%. Foreign investors net sold around 890 billion won, or roughly $650 million, of South Korean stocks, underscoring the broad rotation away from regional shares as the Iran conflict intensifies.