By Ankur Banerjee and Gregor Stuart Hunter

(Reuters) - U.S. President Donald Trump's threat to bomb Iran back to the Stone Age has sharply raised stakes in a war now ​in its fifth week and crushed investors' hopes for a swift end to a conflict that is squeezing oil supplies and fanning inflation.

Global markets recoiled ‌on Thursday, with stocks and bond prices sliding, oil surging and the dollar firming after Trump gave little clarity on when the conflict might end.

Trump said the U.S. military had nearly accomplished its goals in Iran, but that it would continue to hit targets over the next two to three weeks and did not say how the Strait of Hormuz, a key shipping route blocked by Iran, might be ​reopened.

"I don't think there was an awful lot in the speech per se, apart from the fact that they're going to keep bombing for the next two ​to three weeks," said Mike Houlahan, director of Electus Financial Ltd in Auckland.

"That pushes out the resolution timeframe farther," he said. "The next ⁠question is because he's extended it, confirmed it's going to take another two to three weeks, does that put added pressure on the fuel supply chain?"

The line charts show the movement of US gasoline price, gold price, dollar index and world stocks since January 2026.

BIG LETDOWN FOR INVESTORS

Investors ​had pinned their hopes on an end to the conflict after comments from Trump earlier in the week, lifting global stocks and pushing the dollar off recent highs. Wednesday's speech, ​however, underscored the likelihood of a prolonged war.

Traders who had added risk exposure swiftly exited those positions ahead of a long weekend.

Oil supply disruption and its impact on inflation have been a central concern for financial markets. Trump's comments on Wednesday were unclear on whether U.S. military operations could end even before Iran reopened the Strait of Hormuz.

Iran's chokehold on the vital waterway has triggered what many ​analysts describe as the worst global energy shock in history. Brent crude was last up more than 7% on the day at around $109 a barrel.

Employees watch U.S. President Donald Trump address the nation on the Iran crisis from the White House in Washington, D.C., on screen at Brooklyn Diner in Times Square, New York, U.S., April 1, 2026. REUTERS/David Dee

"With no plans to reopen ​the Strait of Hormuz that he effectively closed, oil prices are to remain high indefinitely," said Matt Simpson, senior market analyst at Stonex in Brisbane, adding markets would soon face "the next round of ‌inflation".

Trump's speech ⁠and prospects of prolonged disruption to oil supplies have revived market concerns about stagflation - the mix of high inflation and weak growth that roiled markets in March - analysts said.

Japan could face stagflation risks from the Iran war that would be difficult to address with monetary policy, new Bank of Japan board member Toichiro Asada said on Wednesday.

"The key question in all investors' minds is ‘when is this going to be over?’, that is what is creating the volatility," said Russel Chesler, head of investments and capital markets at Vaneck in Sydney.

"We are ​looking at a situation now where we ​are getting into a stagflation situation with ⁠lower growth and higher inflation expectations."

U.S. Treasury yields rose on Thursday on concerns higher inflation would shut the door on easier monetary policy. Ten-year yields rose 5 basis points to around 4.37% .

Markets are expected to remain volatile as investors track developments over the next ​two to three weeks. Analysts expect the dollar and oil prices to rise in the near term as investors shift into ​risk-off mode.

Dollar has its best quarter since late 2024.