Iran's new envoy to the UN nuclear agency, Reza Najafi, says his country will cooperate with the agency to "overcome existing issues once and for all."
Najafi represented Iran at a meeting of the International Atomic Energy Agency's governing board in Vienna for the first time on September 12.
Najafi repeated Iran's position that it would not give up what it sees as its right to a peaceful nuclear energy program.
Western nations suspect Tehran of seeking to develop atomic weapons under cover of its nuclear program, a charge that Iran denies.
Western diplomats welcomed Najafi's statement as a change in tone but cautioned that it remains to be seen whether there will be a change in substance following the election of President Hassan Rohani to replace conservative Mahmud Ahmadinejad.
Based on reporting by Reuters and dph