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Oil prices climb, bond yields rise as US-Iran ceasefire expires

By Thomson Reuters Aug 17, 2026 | 8:16 PM

By Gregor Stuart Hunter

SINGAPORE, Aug 18 (Reuters) – Oil prices crept higher and bond yields rose, blunting paltry gains for stocks at the start of Asian trading on Tuesday as a U.S.-Iran truce expired ​and Tehran said it would shift to a “fully offensive” military posture.

MSCI’s ‌broadest index of Asia-Pacific shares outside Japan was up 0.8%, buoyed by South Korea’s KOSPI rising more than 3% as the Seoul market returned after a holiday. The Nikkei 225 fell 0.3%, while S&P 500 e-mini futures were flat.

The yield on the U.S. 10-year ‌Treasury ​bond was up 0.8 basis point at 4.728%. Its ⁠30-year counterpart traded up ⁠0.6 basis point at 5.3146%, its highest in more than two decades.

“Typically, moves above 4.65% for the U.S. 10-year have been followed by some soothing words from the Trump administration, typically centred on an imminent resolution ​to the war with Iran,” ING analysts wrote. “This time, we’re not hearing the same,” they added. “In fact, the latest indications are for no imminent resolution ⁠as the shaky 60-day truce came to ⁠an end.”

As the recent global selloff in bonds deepened, the ​yield on the 10-year Japanese government bond rose 2.5 basis points to 2.945%, ​a three-decade high.

Overnight on Wall Street, the S&P 500 slipped 0.5% ‌while the Nasdaq Composite edged 0.3% lower as soft U.S. economic data, including an unexpected drop in retail sales, prompted markets to scale back bets on an imminent Federal Reserve interest rate move.

“Markets adopted a generally risk-off tone ⁠as President Trump reaffirmed he was not interested in extending the truce with Iran, with renewed tensions in the Middle East pushing oil prices higher and complicating ⁠sentiment,” Westpac analysts wrote ‌in a research note.

The U.S. dollar index, which measures the ⁠greenback’s strength against a basket of six currencies, traded ​around ‌a two-month low of 99.527.

Oil prices rose more than $2 ​on Monday as ⁠the stalemate in Iran refocused oil traders on global supply worries. Brent crude futures edged up 0.2% to $91.06 a barrel as trading resumed in Asia.

Gold was up 0.1% at $4,420.07, extending recent gains into a third consecutive day.

In cryptocurrencies, bitcoin was up 0.1% at $64,398.48, while ether gained 0.3% to $1,911.40.

(Reporting by Gregor Stuart Hunter; ​Editing by Sonali Paul)