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Impact on Iran’s petroleum exports remains constrained as a result of the action.
The provided link to the U.S. Department of State's press release (https://www.state.gov/releases/preview/660273/) is currently inaccessible due to technical difficulties, displaying a 'forbidden' error. Without access to the specific content of the press release, I cannot verify the accuracy of the statement regarding actions constraining Iran's ability to export petroleum through obscure and fraudulent mechanisms. Therefore, the claim's accuracy cannot be determined at this time.