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World powers are set to begin two days of talks in Geneva with Iran on its controversial nuclear programme, but no major breakthrough is expected, the BBC reported. 

Iran's foreign minister said he hoped a "roadmap" could be reached, describing the process as "time-consuming.”

Iran's new President Hassan Rouhani, who is seen as a relative moderate, has said he wants a deal within six months.

The West suspects Iran is seeking to achieve a nuclear arms capability - a claim denied by Tehran.

Ahead of the talks, Israel warned that it would be a "historic mistake" to ease pressure on Iran.

Iran will hold discussions with representatives of the so-called P5+1 group, made up of Britain, China, France, Russia and the US plus Germany.

The Iranian team is led by Foreign Minister Mohammad Javad Zarif, although much of the actual negotiating is expected to be delegated to his deputy, Abbas Araqchi.

"Tomorrow is the start of a difficult and relatively time-consuming way forward," Mr Zarif posted on his Facebook page.

"I am hopeful that by Wednesday we can reach agreement on a roadmap to find a path towards resolution."