US envoy Steve Witkoff has said President Donald Trump opposes Tehran continuing any enrichment, calling it a “red line”.

A leaked United Nations report shows that Iran has ramped up production of uranium enriched to 60 percent, short of the roughly 90 percent required for atomic weapons but significantly above the 4 percent or so needed for power production.

Baghaei dismissed the report as biased, accusing unnamed Western countries of pressuring the UN to act against Iran’s interests.

Official sources cited by The New York Times said the recent US proposal includes a call for Iran to end all enrichment.

While Tehran has confirmed receipt of the proposal, which the White House described as being in Iran’s “best interest”, it has said it is still reviewing the document.

“Receiving a text certainly does not mean accepting it, nor does it even mean that it is acceptable,” Baghaei said.

The Reuters news agency quoted an unnamed Iranian diplomat as saying that Tehran is in the process of “drafting a negative response to the US proposal, which could be interpreted as a rejection”.

The official described the proposal as a “non-starter” because it does not soften the US’s stance on enrichment or offer a “clear explanation” of sanctions relief, according to the report.

Iran has held five rounds of talks with the US since April 12 in search of a new agreement to replace the deal with the leading powers that Trump abandoned during his first term in 2018.