The report said Tehran would hand over nuclear material to a third country, provided it receives guarantees that the stockpile would be returned if talks collapse or if Washington withdraws from any agreement.

Iran also signalled it could gradually reopen the Strait of Hormuz to commercial traffic in parallel with a lifting of the US maritime blockade, with nuclear issues to be negotiated over a 30-day period.

According to the report, Tehran is prepared to suspend uranium enrichment for a limited time, though for a shorter duration than the 20 years sought by Washington.