I don't agree with Dr. (Rand) Paul. I was glad to hear that he wasn't promoting regime change because nothing will do that, short of war, and he would be naive to think so.
I personally don't think sanctions will prevent any state sponsored terrorism. Rand seems to think so and he may have info that we don't so I am willing to give him some wiggle room on this. But the bottom line is that sanctions
1. Hurt the common citizens
2. Rally people around the oppressed regime
3. Incite hatred towards the aggressor countries
4. Do not accomplish their intent
I don't recall Castro being thrown out of power when we started sanctions on Cuba. To the contrary he remained in power longer than many leaders in modern history.