What are the reasons for the collapse of the socialist regime?

In short, the socialist economy was objectively inferior to the economies of the countries of the West and Japan; to this must be added decomposition from within and severe pressure from outside. Labor productivity in our country was lower than in developed countries. In some areas, for example, in armament and space, we could compete with the West, but on the whole we were far behind it in terms of technology. Nobody believed in the coming of communism, and even close, corruption was gaining momentum. The people of the West and America considered the enemy as an enemy and at the same time believed that there was a paradise life, all goods were much better than ours, etc. The arms race was drawing all resources and forces from the USSR. Citizens of many countries of the Warsaw Pact, and in some republics of the Union considered our country to be an occupier.