Asian shares retreat from record highs as oil climbs on Iran tensions

Oil climbed above $103 a barrel and Asian shares eased back from record highs as renewed tension around Iran rattled markets from Tokyo to Wall Street futures. The move underscored how quickly a shipping flare-up in the Gulf can reach retirement accounts, borrowing costs and inflation expectations far beyond the region.

Japanese, South Korean and Taiwanese benchmarks had all touched record highs earlier in the session before giving way to selling. The retreat came as European stock futures slipped and Wall Street futures traded lower in Asia, a sign that investors were trimming risk rather than betting that the latest Middle East strain would fade quickly.

The pressure on markets was tied to fresh concern over energy supplies. Brent crude was trading above $103 a barrel, with oil’s advance linked to stalled U.S.-Iran talks and continuing restrictions on trade through the Strait of Hormuz, the narrow waterway that carries a major share of the world’s crude shipments. Any disruption there can tighten global supply, lift fuel costs and complicate the outlook for inflation just as central banks have been trying to gauge when price pressures will settle.

The latest alarm followed reports that the U.S. military intercepted at least three Iranian-flagged tankers in Asian waters and redirected them away from positions near India, Malaysia and Sri Lanka. Those moves added to several days of maritime tension around the Gulf, where shipping routes have become a live risk factor for traders watching oil, freight and insurance costs.

The equity pullback also showed how fragile the rally had become even after a strong run in Asia. Investors had been willing to look through geopolitical noise while focusing on corporate earnings and the momentum behind chip-driven gains, but the renewed strain with Iran kept that optimism in check. With a peace deal still out of reach, the market signal was clear: oil is no longer just an energy story, but a broader warning that geopolitics may be resetting the global risk outlook.