TEHRAN -- The head of the Atomic Energy Organization of Iran said Wednesday any potential visit by the head of the UN nuclear agency to the country needs to have a specific objective. “This trip needs preparations and content and the aims and schedule of this trip should be determined,” Muhammad Eslami said. He was referring to remarks by Rafael Grossi last week that said he wanted to go to Iran in February for “much-needed dialogue” over the resumption of Tehran’s cooperation with the agency on its nuclear activities.