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Western countries suspect Iran is trying to enrich uranium to build atomic bombs.
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It launched work to enrich uranium to a 20 percent level in February.
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Iran's decision to enrich uranium is irreversible, its foreign ministry said last night.
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And sometime in 2001 North Korean scientists began to enrich uranium in significant quantities.
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USEC is now building its new American Centrifuge Plant to enrich uranium at the site.
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Tehran never officially responded but made clear it wanted to enrich uranium on Iranian soil.
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Centrifuges enrich uranium by spinning it at supersonic speeds.
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Iran will not give up its right to enrich uranium, a senior Iranian official said today.
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Western governments believe the Islamic Republic is attempting to enrich uranium for use in atomic bombs.
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Iran says it needs to enrich uranium to 20 percent purity for a medical research reactor.
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Iran says its program to enrich uranium for nuclear fuel is designed for peaceful electricity generation.
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These could enrich uranium two to three times faster than Iran has done so far, experts say.
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North Korea can take what experts see as an experimental programme to enrich uranium into full-scale operation.
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Iran, though, insists it has the right to enrich uranium and refuses to suspend its enrichment efforts.
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Iran has also stoked Western suspicions by starting to enrich uranium deep inside a mountain at Fordow.
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Iran insists its right to enrich uranium is not negotiable, despite Security Council demands it halt such work.
