"We think that they can open up tomorrow's (Friday's) talks with one phrase -- and that is to accept Iran's right, particularly its right to enrich," chief negotiator Jalili said in an address in Almaty on Thursday.

Heading the Iranian nuclear negotiation team, Jalili arrived in Almaty on Wednesday for the second round of talks with the six major world powers in the Kazak city.

Iran and the P5+1 (China, Russia, France, Britain and the US plus Germany) have held several rounds of talks with a focus on the Iranian nuclear energy program. The last round of negotiations between Iran and the P5+1 group was held in Almaty on February 26-27.

The US, Israel and some of their allies claim that Iran is pursuing non-civilian objectives in its nuclear energy program, with the US and the European Union using the false claim as pretext to impose illegal sanctions against Iran.

Tehran rejects the allegation about its nuclear energy activities, arguing that as a committed signatory to the nuclear Non-Proliferation Treaty (NPT) and a member of the International Atomic Energy Agency (IAEA), it has the right to use nuclear technology for peaceful purposes.