There is evidence that the sanctions are hurting the regime. Unfortunately, in certain respects, they're also hurting ordinary Iranians.
The regime today is as much a theocracy as it is a kleptocracy. Basically, the scale of corruption is extensive, and it's one of the ways the regime buys the loyalty, let's say, of the top elements of the Revolutionary Guard. And it's the way it finances its considerable apparatus of repression. It takes money to have thousands and thousands of people spying and monitoring, engaging in propaganda, and beating and torturing.
The point, though, is that the only thing being incentivized is Iran's cooperation on the nuclear issue. So it is the understanding of the Republic of Iran that if it makes concessions in relation to the nuclear issue, the international community is not going to make much of its repression of its own citizens. And that is where the international community is making a mistake. It should be understood that there is a cost attached to human rights violations, and I believe the regime does engage in a cost-benefit calculus. Despite its extremist rhetoric, I believe it's quite a calculating regime.