The UN's atomic watchdog says it's ready to inspect Iran's alleged nuclear sites - if it's given permission.
The IAEA's representatives have arrived in Tehran, to renew talks which have been at a standstill since August. Inspectors hope to gain access to the Parchin military base, near the capital.
They claim the facility may have been used to develop nuclear weapons, and cleaned up afterwards - an accusation yet to be backed by evidence. However, as Maria Finoshina reports, the burden of proof is now weighing even heavier on Iran.
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