Summary: Iran's nuclear power programme has been a source of international tension for the past decade. At no point has it been able to shrug off the suspicion that its pursuit of nuclear energy is also an effort to make nuclear weapons. Iran insists it has no such ambitions but many of the world's major powers remain unconvinced and Israel is warning it will attack. Katya Adler talks to Dr Ali Asghar Soltanieh, Iran's ambassador to the UN's nuclear watchdog, the IAEA.
