TEHRAN: Iran on Monday called on European countries to guarantee an existing nuclear deal that the parties are set to revisit during a planned resumption of talks in Vienna.

"The European capitals, including Berlin, have been passive spectators," foreign ministry spokesman Saeed Khatibzadeh told reporters.

"We therefore expect all parties, when they arrive in Vienna, to know that they have no choice but to adhere to their obligations under the nuclear deal," he said during his weekly news conference.

"They must give their clear assurance to the Islamic republic that this time, no party will violate the nuclear deal," he continued.

The deal was concluded in 2015 with the US, UK, China, Russia, France and Germany and it offered Iran relief from international sanctions in exchange for drastically limiting its nuclear programme, while also placing it under UN supervision. But the US unilaterally pulled out of the deal under Donald Trump and reimposed sanctions, prompting Tehran to gradually renege on its commitments.