On the way back the bring food from Soviet Ukraine to starving Poland in Solidarity time.
It seems that soviet propaganda worked and is still infecting your brain.
In 1980's Polish railroad workers would wels train wheel to the tracks to delay transport of Polish food to the USSR. Soviets have always had problems with food supply due to their fantastically inefficient practices, corruption and alcoholism.
1980's was the times of the embargo on grain exports to the USSR. Soviets could not produce enough to feed their own and the official propaganda stated that the great Soviet nation suffers shortages because they need to help Poland, devastated by the Solidarity movement.
Btw. the largest country in the world, with all the resources one could dream of, and they still couldn't produce enough food.
But there are good reasons for that. In the USSR ideology was the food, and it would override all common sense decisions. In 1930's, I believe, Stalin wanted to have a proof that collective farming is better than individual ways. A group of individuals were given plots of land, and an equal area of land was given to a collective farm. After a couple years the yields were compared. The collective farms were about 10 times less efficient than the private ran plots of land. The Soviet conclusion was that the individual farmers taking part in the experiment were to be... sent to prisons, since their actions were counter revolutionary and dangerous for the Soviet people.
And your mention nothing of food smuggling from the USSR either. They are mostly so called luxury items.