Do oil import sanctions work?

Oil export embargoes have hardly any sanctioning effect on autocratically governed countries with large oil reserves and an environment with functioning global oil and financial markets. Oil embargoes cause damage to the sanctioned governments if the autocrats‘ future power situation is uncertain. There is a sanction effect under these conditions, which is greater if there are no concurrent sanctions on the financial markets: sanctions on the financial markets and sanctions through oil embargoes prevent each other‘s effectiveness.