Boomerg: European companies flocking back to Iran are doing so without their favored lenders at their side. Less than two years after BNP Paribas SA agreed to pay a record $9 billion U.S. fine in part for dealings with Iran, many of the continent’s biggest banks remain unwilling to go anywhere near Iran-related business for fear that they will run afoul of remaining U.S. sanctions on the country. Bloomberg's Fabio Benedetti-Valentini reports.