• Brent crude climbs to a three-week high as US-Iran talks stall.
  • Market risk premium rises over potential supply disruptions in the Middle East.
  • Traders eye further volatility as diplomatic uncertainty persists.

Oil futures surged on Tuesday, with Brent crude rising nearly $4 a barrel to hit its highest level in three weeks, after negotiations between the United States and Iran hit an impasse. The stall in diplomacy has reignited fears of supply disruptions in the Strait of Hormuz, a critical chokepoint for global crude flows.

"The breakdown in talks adds a significant geopolitical risk premium to prices," said a senior trader at a European energy hedge fund. "Without progress, the market is pricing in a higher chance of sanctions or even military escalation."

Brent crude settled at $72.85 a barrel, up 5.1% on the day, while West Texas Intermediate rose 4.8% to $68.90. Trading volumes spiked as investors rushed to cover short positions and hedge against further upside.

The negotiations, aimed at reviving the 2015 nuclear deal and easing sanctions on Iranian oil exports, had shown tentative signs of progress in recent weeks. However, sources familiar with the matter said the talks collapsed late Monday after disagreements over nuclear enrichment levels and sanctions relief. Iranian officials did not respond to requests for comment.

The supply backdrop remains tense. Iran's oil exports have already been constrained by US sanctions, but a complete halt to diplomacy could lead to tighter enforcement and raise the risk of disruptions to tanker traffic. The US Navy's Fifth Fleet, based in Bahrain, has increased patrols in the Gulf, according to a defense official.

"We're in a period of maximum uncertainty," said Helima Croft, head of commodities strategy at RBC Capital Markets. "The market is now pricing in a worst-case scenario where Iranian oil stays offline and other producers struggle to fill the gap."

Global demand expectations are also in focus. While the International Energy Agency recently trimmed its demand forecast due to slowing economic growth, the immediate supply risk is dominating sentiment. OPEC+ is set to meet next week, but analysts expect the group to hold output steady.

The stall in talks comes amid a broader geopolitical realignment in the region. Saudi Arabia and the United Arab Emirates have deepened ties with Israel, while Iran has expanded its military cooperation with Russia. These dynamics complicate any diplomatic resolution and keep the risk premium elevated.

For consumers and businesses, higher oil prices could feed into inflation and raise input costs across transportation and manufacturing. Central banks, already grappling with sticky inflation, may face renewed pressure if energy costs persist.

Historically, crude has rallied during periods of stalled US-Iran diplomacy before retreating if talks resume. But this time, the stakes feel different. "The diplomatic window is narrowing," said a former US diplomat familiar with the talks. "If there's no breakthrough in weeks, not months, the risks escalate sharply."

Editor's note: This article has been updated to reflect market close prices and to include analyst comments received after initial publication.