Mohsen Rezaei, Secretary of Iran’s Supreme National Security Council, said during a meeting in Tehran with Pakistan’s army chief, Field Marshal Asim Munir, that Iran will not allow even a small amount of its enriched uranium to be taken out of the country.

The fate of Iran’s stockpile of more than 400 kilograms of uranium enriched to 60% purity is one of the main sticking points in US-Iran peace negotiations.

The US wants to seize the stockpile or at least have it removed from Iran. Tehran insists on retaining the material, but has proposed reducing its enrichment level. Several third parties, including Russia, have proposed taking custody of the uranium. Reaching an agreement will be difficult.