South Africa comes to mind.
More generally though, economic sanctions usually don't create regime change, they convince regimes to quietly change policies. Sometimes it works, sometimes it doesn't. However even if it doesn't work, it can weaken the regime to the point of irrelevance. Sanctions did not cause regime change in north korea, but it made them so poor that they weren't really a threat.
And really this isn't sanctions, this is a blockade which is sanctions on steriods.
> Iran seems to think they can get a more favorable deal because the US has no appetite to make this a long war. I think there is evidence to support that position.
Who can hold out longer is the million dollar question. US clearly has no appetite for war, especially this one. Iran clearly is economically struggling (If it gets to the point where they can't pay the police or the populace cant afford food, things can get very bad very quickly). Long term the leverage on the strait will disappear as the market finds alternative.
So who is more on the clock? I guess time will tell.