Russian scientist 'helped Iran's Seyyeds with nuclear weapons programme'

The latest document covers the problem of detonating a nuclear device. Its suggestion that a Russian scientist was involved is the first evidence that foreign experts had a direct hand in Iran's nuclear programme. ... But the IAEA believes this individual was not working on behalf of the Russian authorities and was present in Iran on a freelance basis. After the Soviet Union's collapse in 1991, some Russian nuclear experts are known to have left to work for other governments."