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"It's a big deal," says Iran sanctions expert Mark Dubowitz, "because it complicates Iran's ability to move billions of dollars through the international financial system."
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Dubowitz, the executive director of the Foundation for Defense of Democracies, cautions that severing most Iranian ties to SWIFT "is not a sanctions silver bullet."
He says there are ways to get around it, even for the very large transfers that are needed in the petroleum trade, where a supertanker full of crude oil can be worth more than $200 million.
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