Oil prices rose almost 6% after U.S. President Donald Trump said Wednesday that the interim agreement with Iran is "over," although he would allow discussions to continue.
Trump made the comments following U.S. strikes on Iran in reaction to attacks on three ships in the Strait of Hormuz. The price of Brent crude oil jumped 5.6% to more than $78 a barrel. U.S. benchmark crude surged 5.8% to $74.55 a barrel.
"For me, I think it's over," Trump responded when asked about the status of the ceasefire. "It's just a waste of time dealing with them," he said on the sidelines of the two-day NATO summit in Ankara, Turkey.
Crude prices had declined recently from spikes well above $100 a barrel to around the levels they were at before the war with Iran began in late February.
Iran and the United States agreed as part of their interim deal on ending the war to allow ships to pass through the strait without paying charges for 60 days. But Tehran has insisted it must control the vessels' routes and vowed to later charge fees for passage. That would upend decades of practice in the waterway. The ships attacked Tuesday all appeared to be using a route close to Oman's shore, rather than one ordered by Tehran.
The upsets for oil markets have coincided with waves of worries that the craze for artificial intelligence-related shares has pushed prices past the amount of gains in productivity and profits likely to result from massive investments in computer chip production capacity and data centers.
"As such, geopolitical headlines will likely determine market sentiment over the coming hours. A further deterioration in the situation could weigh further on equity valuations along with rising stress in technology," Ipek Ozkardeskaya of Swissquote said in a commentary.
In share trading, Germany's DAX shed 1.1% to 25,191.69 and the CAC 40 in Paris gave up 0.9% to 8,358.67. Britain's FTSE 100 slid 0.8% to 10,579.09.
The future for the S&P 500 edged 0.1% lower and that for the Dow Jones Industrial Average was down 0.4%.
In Asian trading, Tokyo's Nikkei 225 lost 2.1% to 66,819.05, while the Kospi in South Korea shed 5.4%, to 7,246.79.
The South Korean index has soared and then fallen back, briefly surpassing the 9,000 level last month and then succumbing to bouts of heavy selling of big AI-related tech shares like Samsung Electronics and SK Hynix. Samsung fell 6.3% early Wednesday after dropping about 7% the day before. SK Hynix shed early gains to drop 5.7%.
Taiwan's Taiex rose 0.6%.
In Hong Kong, the Hang Seng rose 3% to 24,193.56.
Hong Kong traded shares of Chinese AI model startup Zhipu, known also as Z.ai and traded as Knowledge Atlas Technology, rose nearly 14% on Wednesday.
A six-month lock up period for "cornerstone" investors after its $558 million trading debut in Hong Kong in early January expires this week. State-owned China National Radio reported late Tuesday that nearly 70% of Zhipu's cornerstone investors are committed to stay on, despite previous worries that the lock up period expiration could trigger a sell-off of shares. Zhipu's share price has risen more than 1,300% since its January trading debut in Hong Kong.
The Shanghai Composite index declined 0.5% to 3,970.88.
Elsewhere in Asia, Australia's S&P/ASX 200 shed 0.2% to 8,785.10, while India's Sensex lost 0.7%.
On Tuesday, the roller-coaster ride for AI stocks whipped back down, dragging Wall Street lower.
The S&P 500 fell 0.4%, though the majority of stocks within the index rose.
The drops for stocks in the artificial-intelligence industry dragged the Nasdaq composite 1.2% lower, while the Dow Jones Industrial Average dropped 0.2%.
Advanced Micro Devices sank 6.5% and Intel shed 9.7%. Micron Technology lost 4.7%.
SpaceX, which owns the xAI business, fell 6.8% in its first day of trading after it was included in the Nasdaq 100 index .
In other trading early Wednesday, the U.S. dollar rose to 162.26 Japanese yen from 162.11 yen. The euro climbed to $1.1426 from $1.1414.
