The problem is that they were allies of Germany until Germany attacked them :) and they also wanted to conquer all of Europe, not just preparing to defend their own territory

and the main reason for the deficit was preparation for the war, not the desire to make people's lives in the country better. Nothing prevented the Soviet Union with the Communists at its head from being an ally before the war with the Germans, attacking Poland together and attacking Finland, suppressing protests in Czechoslovakia and Hungary

Okay :) but everything was in deficit :) and this is not a production problem :) this is a problem of sick heads in power and a complete lack of empathy for the country's citizens :) in relations between people, the deficit created corruption, with which Ukraine still has big problems. A habit was created to solve all cases not according to the law. People could not travel abroad without a large number of certificates and the personal permission of the local head of the party. Soviet engineers, having good talents, proposed different concepts of cars that were very modern, but the local leadership said no to any initiative from below. It was easier for them to simply copy Western equipment, or buy Western equipment and pass it off as their own, as Russia is doing now under sanctions. Now, under capitalism, you can protest and at most they will give you something like a fine for hooliganism. Under the Soviet Union and the Communists, there were no protests, or if there were, people were sent to Siberia, and their families were dismissed from their positions, and they had a label in front of state bodies that their family was unreliable. And the journalists did not say anything about it under the pressure of censorship, not even a hint. People learned all the information about the protests only after the collapse of the Soviet Union. And something similar happens in any country that wants to build communism. People become communists in their eyes, often not for the sake of making the world better, but for the sake of getting back at a system in which they are marginalized and losers

okay, despite the cultural and resource diversity, what prevented then in the Soviet Union from making normal food en masse for people like sushi or even shawarma? Why was there only sausage and chebureks, buns, vodka, beer everywhere? Because there is an order to do so and there is a chain of manufacturers, there was no initiative from below, although the country was supposed to be for the people. Due to the size of the state apparatus for serving the population, any initiative was lost. In the end, everything was done only when the old grandfather wanted to show off in front of the West :) there is nothing made of high quality in the Soviet Union, except for missiles that were sold to other countries to shoot at people :) and everything that served the military industry.

Yes. Food in the shop had a bad quality with a permanent deficit. Big amount of good food in modern country is making by a small business