Delegation members stand with security as they arrive at the Omani embassy, where the fifth round of US-Iran talks takes place, in Rome, Italy, May 23, 2025. (Photo: REUTERS)

Araqchi told state TV, "The proposals and solutions will be reviewed in respective capitals ... and the next round of talks will be scheduled accordingly."

A senior US official said, "The talks continue to be constructive – we made further progress, but there is still work to be done."

The stakes are high for both sides. President Donald Trump wants to curtail Tehran's potential to produce a nuclear weapon that could trigger a regional nuclear arms race and perhaps threaten Israel. The Islamic Republic, for its part, wants to be rid of devastating sanctions on its oil-based economy.