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Sanctions can only do so much. We all know that. I doubt it can fully convert a country. Heavily-sanctioned countries like North Korea, Venezuela, Cuba, Iran, and others are still standing on their feet. Russia is apparently richer than these countries so we won't be expecting it to bow down either. However, this doesn't mean that they're ready or have prepared for it. It's just that crazy leaders like Kim Jong Un and Putin couldn't care less about sanctions. These sanctions are not taking any luxury or power from them. Neither Kim nor Maduro nor Putin is deprived of a sumptuous meal because of their madness. But their people are.
More than a month since the invasion, instead of successfully taking over Ukraine, setbacks are now seen. I am certain that even with another month of extension in this foolishness, Russia will not be able to take Ukraine despite all the propaganda that they have calculated and are ready for everything. And I am very much willing to put my money where my mouth is. I am willing to bet for this. Are you?
There is a nuance that you did not take into account. North Korea, Venezuela, Cuba are small countries, countries where life is bad are a common thing. Iran cannot be called a small country, but after the overthrow of the secular government, it turned into a virtually medieval country, with a tough, totalitarian government, where a low standard of living is commonplace. This time. Two - such a number of sanctions, with such a variety as in Russia, are not and have not been in the listed countries. They also do not have the collapse of the army, and the loss of confidence in the authorities. There are many more differences. And most importantly, Russia needs to maintain a huge number of security forces, to contain internal tensions, it is necessary to support "Putin's friends" who have lost hundreds of billions of dollars, it is necessary to contain at least 100 million biomass, which, although used to living at the bottom, can start a revolution, to replace an unsuccessful king with another king. Therefore, sanctions for Russia-have a devastating effect, for the countries you listed-an uncomfortable effect.