How did Germany and the USSR prepare for war?

If we consider the preparation for the war of 1941-1945. then Germany was already ready for it – it had significant combat experience gained during the military campaign in Europe, its military potential grew not only at the expense of its own resources, but also at the expense of the resources of the other European countries subordinated to it. The USSR hoped to a greater extent that if there was any military conflict, it would take place on the enemy’s territory, an offensive strategy was developed, and therefore no proper strengthening of the borders was done, the necessary technology was not developed, which played a role in the first period of the war …