The western sanctions will hit the Russian economy in the long term, the Russian oil prices are 30% lower than the western oil prices.
Russia will have to sell more oil, gas and food to China, but the prices will be low, so the export revenue won't bring bigger profits for the Russian economy. The biggest negative effect of the sanctions will be the technological deterioration of the Russian economy, which will happen slowly, in a matter of several years.
Nobody is denying the fact, that the western sanctions will hit the western economies ae well. This is the side effect of globalization. The countries and their economies have become codependent on each other. The sanctions will end the state of codependency and create a more fragmented and divided global economy.
I don't think Russian economy will be destroyed just because of western sanctions, maybe in other respects I can agree with you like sports, tourists or others, but from an economic point, I doubt that Russia will be destroyed, right now the EU is imposing sanctions on exports of gas, oil and minerals from Russia, but did you know that in fact it could backfire for EU countries?
Russia the third largest country as a producer of gas, oil and minerals for European countries and if they stopped shipping gas, oil and minerals wouldn't it make it difficult for the industry in the European continent to run?
I think as a country with oil and gas producers of course it is not difficult for Russia to find other importers besides China and I don't think China will be able to dictate to Russia to sell its gas and oil at cheap prices because it is clear that it has violated the mutual agreement later, even at the Union Summit Europe yesterday in Brussels, it seems that the cohesiveness of the European Union in carrying out sanctions against Russia has begun to crumble, even Hungary, Slovakia and the Czech Republic have begun to reject the sanctions because of their dependence on Russian oil and gas so far.