"it's really too soon to tell whether Iran has returned with a more constructive approach to the new round of JCPOA [Joint Comprehensive Plan of Action] talks," Price told journalists.
Price added that there has been some progress in identifying the complex issues left to be negotiated in terms of how Iran returns to full compliance with its nuclear commitments under the JCPOA.
"But the fundamental situation has, as of today, not changed," he added.
The eighth round of talks to bring Iran back to the nuclear deal and lift US sanctions began in Vienna on December 27.
In 2018, the United States withdrew from the JCPOA, which had been signed between Iran, the P5+1 and the European Union in 2015. Thereafter, the US enacted hardline policies against Iran, prompting the latter to largely abandon its obligations under the deal.