Q:  Two weeks ago, the US House and Senate both overwhelmingly approved legislation (HR 2194) authorizing the president to sanction businesses that supply Iran with refined petroleum products or help Iran to produce them.

How does this legislation target the energy sector, and how effective is it likely to be?

A:  The energy-related provisions are designed to strengthen a 1996 law that penalized foreign firms investing $20 million or more in Iran’s energy sector. In addition to