Iran's UN ambassador reports good progress in US peace talks but denies JD Vance's claims about unfrozen assets being spent on American commodities.

"We're going to hopefully make progress on the nuclear issue, make progress on the Lebanon ceasefire issue," US Vice President JD Vance told reporters.

Iran said "good progress" was made during the first day of talks with the United States on issues including the release of Iranian assets and relief from oil-related sanctions.