President Hassan Rouhani said on Sunday he wanted Iran to do a better job of explaining its nuclear programme to prevent "evil-minded" people misleading world opinion, two days before Tehran resumes talks with world powers on its disputed atomic activity. Iran and the United States, France, Germany, Britain, China and Russia will reconvene in Vienna to try to iron out differences over how to end a long standoff over suspicions that Tehran has sought the means to develop nuclear weapons. Western powers have long demanded greater openness from Iran to address those concerns and head off the risk of a downward spiral towards a new Middle East war, with Israel threatening to attack its arch-foe if diplomacy does not rein it in.