VIENNA - The European Union said on Thursday it was disappointed with a lack of progress by Iran in addressing concerns about its suspected atomic bomb research, pressuring Tehran to cooperate with a long-stalled UN watchdog inquiry.The 28-nation EU made the statement at a board meeting of the International Atomic Energy Agency (IAEA), which for years has been investigating allegations that Iran has worked on designing a nuclear weapon. Iran denies the charge.In Britain, France and Germany, the EU groups three of the six world powers that are seeking to negotiate a resolution to a wider, decade-old dispute with Iran over its nuclear program. Those talks resume in New York this week.An IAEA report in early September showed Iran had failed to answer questions about what the U.N. agency calls the possible military dimensions (PMD) of the country's nuclear program by an agreed Aug. 25 deadline."The EU is disappointed with the very limited progress on PMD," the EU statement said. "It is essential and urgent that Iran cooperates fully and in a timely manner with the agency regarding all relevant issues."