In the last 30 years I can’t recall a single time sanctions have worked.
Might be just outside your threshold but the divestment campaign against South Africa is credited with helping to end the system of Apartheid. https://en.m.wikipedia.org/wiki/Disinvestment_from_South_Afr...
Sanctions also didn't do much. There was a thriving market for goods from overseas. Even now more than 30 years later there's a tradition of giving your relatives a list of things to buy when they travel internationally. Sanctions probably indirectly hurt poor South Africans but never anyone politically connected.
What really hurt and forced the Apartheid government to start seeing sense was the IMF ending all loans. http://kora.matrix.msu.edu/files/50/304/32-130-4C3-84-africa...
I think the Swift banking system ban proposal for Russia would be more likely to work.