US 'open' to Iran's suggestion of 'wider nuclear deal'
Three Western officials who spoke to Reuters said the two sides had mostly communicated through the UK, France and Germany - the European parties to the 2015 nuclear deal.
"What we had heard was that they were interested first in a series of initial steps, and so we were exchanging ideas on a series of initial steps," said one US official quoted by Reuters.
"It sounds from what we are hearing publicly now, and through other means, that they may be... not interested in (discussing) initial steps but in a road map for return to full compliance.
"If that's what Iran wants to talk about, we are happy to talk about it," the official added.
After taking office in January, the Biden administration had initially believed that Tehran would want to discuss reviving the Joint Comprehensive Plan of Action - a 2015 deal which saw Iran impose limits on its nuclear programme in exchange for sanctions relief.
Former US president Donald Trump unilaterally withdrew the US from the deal in 2018 and reimposed sanctions.
In response, Iran began exceeding uranium enrichment limits set in the accord. A recent IAEA report also noted that Tehran has started using a new type of centrifuge to enrich uranium.
Despite a new administration now being in the White House, however, Iran has continued to exceed limits set in the accord.
Iran's most recent breaches of the deal are seen as part of a campaign to pressure US President Joe Biden to make the first move in reviving the JCPOA.
Earlier this month, Iranian Supreme Leader Ali Khamenei said Iran would return to the terms of the 2015 accord if sanctions are lifted.