U.S. Secretary of State Hillary Clinton reported today that sanctions the United States and other countries have in place against Iran have significantly hurt that country's oil exports. Clinton said that Iranian oil sales fell by 1 million barrels per day in September and October 2012 compared to the same period in 2011.
The U.S. has significant sanctions against Iran in the hope of stopping the flow of oil income that Iran could use to fund a nuclear weapons program. You can read more about those sanctions here. Clinton's full remarks are here.
Clinton said the results of the sanctions send a clear message to Iran. She said Iran must "take concrete actions to satisfy the concerns of the international community . . . or face increasing isolation and pressure."