U.S. not backing off as Iran sanctions bite

[News Manager]

WASHINGTON (Reuters) - The Obama administration's man in charge of squeezing Tehran over its nuclear program is unapologetic for the difficulties faced by banks in their dealings with Iran since the U.S. tightened sanctions against the country. Companies that trade with Iran are struggling to get paid and the biggest Asian countries are scrambling to work around U.S. sanctions that aim to deprive Tehran of revenue needed to develop its nuclear program. ...

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