Iran and six world powers started a new round of nuclear negotiations on Wednesday, aiming to reach an agreement on Tehran's disputed atomic activities by late July.
After three months of broad discussions between Iran and the U.S., France, Russia, Britain, China and Germany, the sides plan during their May 14 to 16 meeting in the Austrian capital to start drafting the text of a final accord that could put an end to years of hostility and mistrust.
Wide differences must still be overcome, especially regarding the size of Iran's uranium enrichment program, and a successful outcome is far from guaranteed.
Iran denies Western allegations that it has been seeking to develop the capability to make atomic bombs, saying its nuclear program is a peaceful energy project.
