Top world powers were to meet here to synchronize efforts to defuse fears Iran could try to make an atomic bomb, though Tehran showed no sign of compromise over a nuclear program it says is strictly for generating energy. The talks among China, Europe, Russia and the United States were being held at the level of deputy foreign ministers, but Russian officials were tight-lipped with details on the venue and agenda of the meeting. The meeting however comes as the UN Security Council awaits a report due by April 28 from the head of the UN nuclear monitoring agency on Iran’s compliance with international regulations in its nuclear program. Full Story