"We will help whenever we can, but of course there is a limit to where we can go," Celso Amorim told reporters on the sidelines of an official visit to Austria.
Brazil and Turkey last month brokered an Iranian nuclear fuel-swap deal in hopes that they would at least delay new U.N. sanctions, but the new penalties were imposed nonetheless.
Iran said Monday it has banned two U.N. nuclear inspectors from entering the country because they disclosed to the media the contents of a "false" report on the country's disputed nuclear program before the U.N. nuclear watchdog reviewed it.
