A US Treasury official was quoted recently, reminding us that Iran is artfully evading global sanctions through Bank Melli's subsidiary, Mir Business Bank. Mir, acting through other Russian banks, is facilitating Iranian trade transactions, especially commodities. You are advised to examine closely client transactions, involving commodities, especially wheat, being processed through Russian banks, for they may be fronting for Mir transactions.
Where are the shipment goings ? To a location where they can be conveniently transshipped to Iran, perhaps ? Examine such business transactions carefully.