TEHRAN: Nuclear discussions between Iran and six world powers are advancing in a good atmosphere but progress is “slow and difficult,” a senior Iranian diplomat has said. The remarks from Abbas Araqchi, a leading member of Iran’s negotiating team at talks being held in Vienna, were carried on Friday by the ISNA news agency. “It’s a good atmosphere and discussions are moving forward in a spirit of goodwill, but they are moving very slowly and with difficulty,” he said. The talks in Vienna, aimed at securing a permanent deal on the extent of Iran’s nuclear activities, started on Wednesday but there has been little indication of how they have gone so far. Britain, China, France, Russia, the United States and Germany want Iran to radically scale back its nuclear activities, making any dash for an atomic bomb virtually impossible and easily detectable.