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In the Soviet years building codes have been clearly defined, and break them it was impossible. One of the immutable rule applies to residential doors. Open they were exclusively inside, the engineers and architects had a good reason to take such a decision.
Today, the remaining "Khrushchev," you can see many more apartments, the doors which are opened in the old inside. Residents who had to make repairs, often ignore this rule, without thinking about how dangerous can be a solution.
There are several theories as to why it was decided to set the doors opening "inside." One of the most politicized lies in the fact that since the alleged security officers have been easier to enter the apartment if necessary. Of course, it is more urban legend than historical fact: it is obvious that the KGB any door would not become an obstacle.
In fact, the reason is different. This rule is dictated by security considerations: it is necessary, in the event of a mass evacuation of the doors of all the apartments at the same time opened freely without blocking each other. Confirms this version the fact that, for example, building regulations in 1985, this rule is not It extended to the residents of apartment buildings in which the stairwell areas allow unhindered to open the door.
Stairways in "Khrushchev" built a minimum of space exclusively for reasons of economy. As for the main escape routes (e.g., a ladder outputs access doors in skyscrapers), then It operates a clear principle: the door should open in the direction of movement, ie in the direction of exit. If they are installed in the opposite direction, there is a high likelihood that under the pressure of the crowd, those who are closest to the door will not be able to open it.
Interestingly, the doors in private homes too often open inward. This is done for practical purposes, that during the winter snowfall owners did not stay locked in the house.
In the planning of the "Khrushchev" there are many other tricks that are not always understood by the modern residents. Many wonder, Why in the "Khrushchev" did a window between the kitchen and bathroom.
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A source: https://novate.ru/blogs/120918/47760/