Some big companies have begun signing deals with Tehran since the U.S. and other global powers lifted long-running sanctions against the Middle Eastern country, but banks are very nervous after being burned in the past.
So while they may see attractive commercial opportunities in the country of about 80 million people, they're treading very carefully because some sanctions still linger, including a ban on conducting transactions with Iran in U.S. dollars. U.S. banks are also still banned from dealing with Iran.
The removal of many sanctions in January was part of a deal designed to prevent Iran from obtaining or building a nuclear weapon.
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