Germany, following the results of the Second World War, was totally destroyed. Industry, infrastructure, major cities were destroyed ... Plus, the USSR alone took out (one can say that it unilaterally awarded itself reparations) took thousands of industrial enterprises to the territory of the USSR.
Also, the USSR took out a huge amount of material and cultural values (from banks, vaults, museums, private collections and other sources), both at the state level and by soldiers of the USSR army.
I assume you are from Russia, welcome, I have spent around two years in your country.
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It's close, but not exact
I was born on the territory of the USSR, on the territory of the republic of the RSFSR (now this fragment of the USSR is called the Russian Federation). I was lucky, as a child I left this dull place for a while, lived for 4 years in Europe, although it was part of the Warsaw Pact, and returned to the USSR, but not to the RSFSR, but to the Ukrainian SSR (today's Ukraine).
At the same time, I still have relatives in the RSFSR / RF. And until 2014, I visited the Russian Federation and they came to Ukraine. This is such an introduction to make it clear that I know well what the USSR is, what the modern Russian Federation is and what Ukraine is
I will say right away - Ukraine is certainly not the most ideal country, but a country that has turned its back on the "Soviet ideology" and has chosen the path of development along the European / Western path. Whether we are changing our lives for good or bad is a matter for discussion. But at least we began to move away from the obviously negative vector - an alliance with Russia, and "the Soviet Union number 2."
But Russia, indeed, as you say - HAD a chance to become the largest economy in the world. A technologically advanced country with a high standard of living. Yes, there are resources, and it seems like the heritage of science and technology of the USSR ... But totalitarianism and "genetic craving for the king at the head" led to what you are seeing now ... Degradation, corruption, theft, tyranny of the authorities, in fact, a slave-owning system, tyranny and as it turned out - total fakes in everything - from the economy to the army ....
Smart people - they left Russia a long time ago and live beautifully and happily in the EU, the USA, Canada, and in many other countries ... The rest chose "an empire, greatness, and so that the whole world is afraid of this empire" ...
The results you see how it ends. The result will be a loud pop of the bubble, even louder than the bursting of the USSR.