I don't disagree with you but I do wonder whether for sanctions to be successful relies a lot on the way the population is feeling about the regime at the start

I don't disagree with you but I do wonder whether for sanctions to be successful relies a lot on the way the population is feeling about the regime at the start. If they population decides to dig in, then the sanctions start to have a negative effect (in terms of getting a desired outcome). If on the other hand the population is already angry at the regime, maybe it has the desired effect. Idle musing without supporting evidence.