Brent crude rose to $91 after Iran ruled out extending its interim deal with the United States and warned it could escalate the conflict, raising fresh concerns over the Strait of Hormuz.
Key facts
- Brent oil rose to $91, according to CNBC.
- Iran ruled out extending its interim deal with the United States.
- Iran threatened to escalate the conflict.
- The interim deal was intended to open the Strait of Hormuz during negotiations.
- A final deal on Tehran's nuclear program was to be negotiated within 60 days.
Oil prices rose on August 17, 2026, after Iran ruled out extending an interim deal with the United States and threatened to escalate the ongoing conflict, according to CNBC.
Brent crude climbed to $91 amid the developments, CNBC reported, as markets weighed the potential impact of renewed tensions on global energy supplies.
The U.S.-Iran interim agreement was designed to open the Strait of Hormuz while the two sides negotiated a final deal on Tehran’s nuclear program, according to CNBC. The final agreement was intended to be reached within 60 days.
Iran’s decision to rule out an extension of that interim arrangement removes a mechanism that had been keeping the strategically vital waterway open, raising questions about the future of shipping through the Strait of Hormuz.
CNBC’s coverage of the day showed prices shifting through the trading session, with one update noting oil prices as little changed before a later report placed Brent at $91.
As of the sources provided, further details on Iran’s specific threats to escalate the conflict, or the United States’ response, were not included.
Why it matters
The Strait of Hormuz is one of the world's most important routes for oil shipments, so any threat to keeping it open can move global energy prices. Rising oil costs can feed through to fuel and broader consumer prices, making the standoff relevant well beyond the countries directly involved.
Frequently asked questions
How high did Brent crude rise?
Brent crude rose to $91, according to CNBC's reporting on August 17, 2026.
What was the interim U.S.-Iran deal meant to do?
According to CNBC, the interim deal was supposed to open the Strait of Hormuz while the two sides negotiated a final agreement on Tehran's nuclear program within 60 days.
Why did oil prices rise?
Prices rose after Iran ruled out extending the interim deal with the United States and threatened to escalate the conflict, according to CNBC.