Oil prices fell to a three-week low on August 4 after Secretary of State Marco Rubio and Treasury Secretary Scott Bessent announced that talks with Iran and Oman had progressed to a point where shipments through the Strait of Hormuz could resume as soon as this week. BBC News

Brent crude, the global benchmark, dropped nearly 5% to under $80 a barrel. US West Texas Intermediate fell more than 5% to $76. Both contracts hit their lowest levels since July 13. The sell-off extends a volatile stretch for crude markets that has tracked every twist in the US-Iran confrontation: prices tumbled more than 6% the prior week when the two sides paused strikes over the weekend, then partially rebounded before today's renewed plunge.

Speaking to reporters at the State Department, Rubio confirmed multilateral discussions involving Oman but cautioned that an agreement was not yet finalized. "There's been progress made in those talks, but not finality yet," he said. "We're hoping that will happen very shortly." Bessent, appearing on CNBC, was more specific on timing. He said a deal could be agreed as soon as Tuesday or Wednesday and told the network there was "a chance we may have a deal today or tomorrow to open the strait and move towards a more normalized position in this conflict."

No details of the framework under negotiation had been released as of the announcement. Asked whether Iran would be permitted to charge for ships transiting the strait, Bessent responded: "It would be freedom of movement." That formulation, if it holds, would preclude a tolling or transit-fee arrangement and frame the reopening in terms of navigational rights rather than a commercial concession to Tehran.

The Strait of Hormuz handled roughly one-fifth of global daily oil and liquefied natural gas supplies before the US-Iran conflict began in late February, when Iran moved to shut the waterway to all shipping. Rubio said at the time that Iran was declaring that no one could pass through. The closure triggered months of escalating oil price volatility. Brent futures settled at $103.54 on May 21 as investors discounted the prospect of a diplomatic breakthrough. Prices later surged above $122 after President Trump threatened to levy charges on shipping while the strait remained closed.

The broader context here is a conflict that has passed through several distinct phases in under six months: initial shutdown, military escalation, a pause in strikes, and now a potential diplomatic off-ramp centered on the strait itself. Bessent's January remarks on the Iranian regime's "Strait of Hormuz extortion network," followed by a July 29 Treasury announcement that it had disrupted that network, suggest the sanctions architecture has been working in parallel with military and diplomatic pressure. The Treasury's reference to "sanctions removals" in its January action signals that the financial channel is part of the bargaining, not separate from it.

Looking at what this means for markets, the price action on August 4 reflects a repricing of geopolitical risk premia that had been embedded in crude since February. Brent's drop from above $122 to under $80 in the space of weeks tracks the de-escalation arc closely. If a deal materializes on Bessent's timeline, the immediate supply shock eases. If it slips, prices could reverse sharply, as they did when hopes for diplomatic progress gave way to renewed strikes. The absence of disclosed deal terms leaves the durability of any agreement an open question. Rubio's emphasis on "not finality yet" is the operative caveat: the market has moved on a signal, not a signed instrument.