VIENNA, Nov 29: Iran’s six-month freeze of its nuclear programme agreed with world powers in Geneva will start by early January, Tehran’s envoy to the UN atomic watchdog indicated on Friday.

“We expect that either at the end of December or the beginning of January we should start implementing the measures agreed by both sides,” Reza Najafi, envoy to the International Atomic Energy Agency, told reporters.

The breakthrough accord struck last weekend between Iran and the United States, China, Russia, Britain, France and Germany – the P5+1 – foresees Tehran rolling back some of its nuclear programme temporarily in exchange for sanctions relief.

The freeze is meant to make it more difficult for Iran to develop a nuclear weapon and to build confidence while Tehran and the P5+1 hammer out a long-term accord.

Iran has pledged to limit uranium enrichment to low fissile purities. It will also lower the purity of its stockpile of medium-enriched material, which is relatively easy to convert to weapons-grade, or convert it to another form.

Iran also committed for six months “not to make further advances” at its Fordo and Natanz uranium enrichment sites and at the Arak heavy water reactor, which could provide Tehran with weapons-grade plutonium once operating.

The Islamic republic, subject to painful UN and Western sanctions, will continue enriching uranium to low levels and it will retain its stockpile of low-enriched material.

It has been unclear since Geneva when the accord was due to take effect, with technical discussions between Iran, the powers and the IAEA, whose job verifying Tehran’s compliance will be key, set to work out the details.

“We have had preliminary discussions with the agency with regard to the nuclear-related measures ... to be verified by the agency,” Najafi said.—AFP