US expands sanctions against Iran ahead of talks
7 February 2013 Last updated at 03:15 GMT
The US has tightened existing sanctions on Iran, in an effort to push Tehran to abandon its alleged nuclear weapons programme.
The measures further restrict Iran's access to its own oil revenues but also include financial restrictions against Iran's state-run media.
Robin Wright is a senior fellow at the US Institute of Peace and has covered Iran for over 40 years.
She told the BBC's Mike Embley that the expansion in sanctions comes ahead of talks between the two countries.