I'm not commenting on the broader topic; just that this strategy has worked before.
Castro died of old age, sanctions still in place for his entire decades-long tenure. While I do believe that sanctions can weaken a regime, I do not believe history shows that they lead to regime change.
Big assumption that the first will lead to the second. Putin's invasion of Crimea led to his highest approval rating, even with the sanction response.
https://news.gallup.com/poll/173597/russian-approval-putin-s...
I know many USSR immigrants here in the states who once despised anything to do with Putin and his ilk, are now buying into Putin’s rhetoric. It’s really weird to see.
I do think Putin’s days are numbered. With the way the war is going, combined with the global support for Ukraine and the sanctions. I don’t see how the oligarchs, the people around him, and the Russian public will take much more of this. Though, of course, I could be wrong and we could be witnessing a new North Korea type situation.
Russia's economy will decline and Putin will be replaced, but it won't happen fast enough (and that disruptive) for it to make impacts on this war.
Countries with smaller economies like Cuba and Vietnam survived sanctions for years and there was no coup.
So, plenty of counterexamples as well.