Burma's isolated military junta is building a secret nuclear reactor and plutonium extraction facilities with North Korean help, with the aim of acquiring its first nuclear bomb in five years, according to evidence from key defectors revealed in an exclusive Herald report today.

The secret complex, much of it in caves tunnelled into a mountain at Naung Laing in northern Burma, runs parallel to a civilian reactor being built at another site by Russia that both the Russians and Burmese say will be put under international safeguards.