U.S. federal prosecutors filed suit late Wednesday to seize four tankers-worth of gasoline Iran is sailing to Venezuela, the latest salvo in the administration’s effort to stifle flows of goods and money helping to keep two of its top foes in power.

By filing a civil-forfeiture complaint, U.S. prosecutors aim to not only prevent delivery of the Iranian fuel to Venezuela, which began the journey last month, but also deprive Tehran of the revenues from the cargo and deter future shipments.

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