Iran said on Sunday it will not accept any deadline set by the West in negotiations to revive its 2015 nuclear deal with world powers.

Tehran also and "politically-motivated" claims by UN watchdog IAEA about its past nuclear work to be dropped, Iranian state TV reported.

Iran International reported on Saturday that according to Western and Iranian foreign ministry sources, the United States has given Iran an “immediate deadline” to respond to a final offer it has received in the framework of talks in Vienna.

The West has been warning Iran that time is running out to revive the 2015 nuclear agreement known as JCPOA, while Tehran is enriching more uranium.

According to some of these sources, meetings held in Tehran to make a decision ended inconclusively, while chief negotiator Ali Bagheri-Kani will return to Vienna Sunday night. Iran said Sunday that he will go back to the Austrain capital to “pursue the talks.”

The foreign ministry also demanded on Sunday the International Atomic Energy Agency end its investigation of Tehran’s clandestine nuclear activities in the early 2000s. "We have answered the agency's (IAEA) questions or politically-motivated claims ... that we think were baseless. These dossiers should be closed," Iranian Foreign Ministry spokesperson Saeed Khatibzadeh said, according to state TV's website. "Iran accepts no deadlines."

The IAEA has found traces of fissile material in different sites in Iran and has submitted questions but has not received satisfying explanations.