The Soviet Union's greatest error was not allying itself with the PRC. Not only would the PRC provide a massive labour market and an ideologically-aligned ally, but the agricultural output of the PRC in terms of high-value foodstuffs (fruit, seafood, etc.) is immense. In fact, the PRC's main agricultural limitation is it's insufficient ability to produce basics (rice, soybean, corn, wheat, etc.), which is the singular thing that the Soviet Union can produce extremely well.