IRANIANS SEE PURPOSE OF OIL SANCTIONS AS REGIME CHANGE
Not nuclear negotiations

"... the U.S. and its European partners move to throttle Iran’s economy by cutting off its ability to export oil... stated goal is to bring Iran to the table to negotiate a deal that would end international concerns over a nuclear program that has given Iran the means to build nuclear weapons—even though, as Defense Secretary Leon Panetta emphasized... U.S. and allied officials believe Tehran has not yet decided to build the bomb...

"Regardless of the Administration’s intent, the new measures, which are explicitly designed to throttle the Iranian economy, are being read in Tehran as further evidence that Washington’s goal is to force regime-change. That’s hardly likely to convince Iran’s leaders that they don’t need nuclear weapons; on the contrary, Iran appears to be bracing itself for war.

http://globalspin.blogs.time.com/2012/01/09/why-new-sanctions-raise-danger-of-iran-building-nuclear-weapons/