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"We hope the fuel exchange will be implemented in the near future," said Mottaki.
The International Atomic Energy Agency proposed last autumn that Iran takes its uranium of 3.5 percent purity to other countries, where it can be processed into high-enrichment uranium of 20 percent. The processed high-enrichment uranium will be then used as fuel for nuclear reactors and for medical purpose.
Iran rejected the deal, urging for a simultaneous swap of the fuel on its soil.
Western powers led by the United States are promoting sanctions against Iran in the UN Security Council for the alleged development of its nuclear program aimed at building nuclear weapons.
Iran denied the allegations, emphasizing that its nuclear program is only for peaceful civilian purposes.
Amorim arrived in Tehran on Monday morning for a two-day visit which aimed at preparing the ground for the upcoming trip of Brazilian President Luiz Inacio Lula da Silva to Iran.