U.S. officials have intensified pressure on Iran to reduce its nuclear enrichment capacity as part of negotiations to end a seven-month conflict, with conflicting signals emerging over the scope of demands.
U.S. officials reiterate nuclear demands as talks stall
U.S. Secretary of State Marco Rubio stated Wednesday that Iran has passed up "multiple" opportunities to reach an agreement on its nuclear program during a visit to Greece. Rubio framed curtailment of Iran’s nuclear ambitions as a critical U.S. demand, though he did not specify the terms of any potential deal. His remarks followed comments by Vice President J.D. Vance, who told Reuters Monday that any agreement to resolve the conflict must include a "meaningful" reduction in Iran’s nuclear enrichment capacity. Vance emphasized that Iran should not build highly enriched fuel, calling it a "basic threshold issue" for U.S. negotiators.
President Donald Trump last week denied reports that he had offered sanctions relief to Iran in exchange for nuclear concessions. The absence of an agreement has coincided with increased regional tensions, including attacks on tankers in the Strait of Hormuz and strikes by Yemen’s Iran-backed Houthis on airports in Saudi Arabia. Energy prices rose Wednesday, with Brent crude increasing 0.64% to $101.23 and U.S. West Texas Intermediate futures climbing 0.21% to $89.63.
Diverging U.S. positions on enrichment thresholds
While Vance’s comments suggested a focus on reducing enrichment levels, Rubio’s remarks did not specify a required percentage or timeline. Rubio also asserted that Iran’s economy was "in total and complete freefall" due to sanctions, claiming funds were being diverted to groups like Hezbollah and Hamas. He reiterated that Iran "cannot have a nuclear weapon," framing the issue as non-negotiable for the U.S.
Earlier this year, Trump publicly opposed any enrichment by Iran, stating in February that Iran did not need enrichment given its oil resources. In April, he said Tehran had agreed to have its enriched uranium removed from the country, though no further details on implementation were provided.
Regional escalation amid stalled diplomacy
The conflict has disrupted global energy markets, with the Strait of Hormuz remaining a critical flashpoint. Rubio claimed Iran had "lost complete control" of the strait, though he did not provide evidence to support this assertion. Meanwhile, attacks on commercial vessels and Saudi infrastructure have continued, prompting U.S. military protection for shipping lanes.
Negotiations have repeatedly faltered despite intermittent proposals from both sides. Vance, who brokered a provisional peace agreement in June that collapsed shortly after, has taken a leading role in diplomatic efforts. He has framed the nuclear issue as a litmus test for Iran’s commitment to avoiding weaponization, arguing that enrichment levels above civilian needs signal otherwise.
U.S. officials have not detailed what constitutes a "meaningful" reduction or whether Iran’s enrichment for civilian purposes would be permitted under any potential deal.