Iranian Foreign Minister Hossein Amir-Abdollahian will head to Moscow on Tuesday, the ministry said, days after negotiations on an Iran nuclear deal stalled amid new Russian demands, AFP reported.

"Russia has made its official demands loud and clear, and this needs to be discussed among all parties to the 2015 agreement, like all the demands that have been presented by other parties," foreign ministry spokesman Saeed Khatibzadeh told reporters on Monday.

"The foreign ministers of the parties (to the 2015 Iranian nuclear deal) are in constant contact", and Amir-Abdollahian "will go to Moscow on Tuesday to continue the discussions", Khatibzadeh added.

More than 10 months of talks in Vienna have brought major powers close to renewing the landmark 2015 Joint Comprehensive Plan of Action (JCPOA) on regulating Iran's nuclear programme.

But the negotiations were halted after Russia on March 5 demanded guarantees that Western sanctions imposed following its military of Ukraine would not damage its trade with Iran.

On March 11, the European Union's foreign policy chief Josep Borrell tweeted that the pause was "due to external factors," despite the fact that "a final text is essentially ready and on the table".