TEHRAN (Reuters) - Iran declined on Friday to endorse proposals by the U.N. nuclear watchdog to help reduce Iran’s stockpile of low-enriched uranium. It said it was awaiting a “positive and constructive” response from world powers to its proposal on providing nuclear fuel for a Tehran reactor producing medical isotopes, state television reported. “Now we are awaiting a positive and constructive response on Iran’s proposal from the other party on providing nuclear fuel for Tehran’s reactor,” TV quoted a member of Iran’s negotiating team, who attended the Vienna meeting on October 21, as saying. Continua…