Sanctions Imposed on Iran for Uranium Enrichment

It does appear as if Bush's ill-conceived war in Iraq forced Iran to halt its limited nuclear bomb program back in 2003. By the Nuclear Non-Proliferation Treaty, Iran is allowed to enrich uranium for civilian nuclear power use.  They are doing so.  The difference between enrichment for power and bombs is huge and easily detectable.  However, the western powers are insisting that Iran can't continue with this legal action.  I don't know why Iran should comply with the rest of the NNPT if they keep getting sanctioned.
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