What are you talking about Soviet mentality? In shipbuilding in the west it was also a thing that ships should be able to double as military vessels for the shipping company to have their building subsidized and corresponding ship classes were thus designed just for this event. Also civilian aircraft nowadays are also able to be converted for military duty, the KC-35 for example is a derivative of the 707. So military capabilities were also built into the design of western planes, that has nothing to do with Soviet mentality but with necessity. And what are you talking about "surprise-dropping nukes" by Aeroflot planes? In the event of a hot war, no civilian Soviet plane would have been allowed to western airspace anyways, an exchange of nuclear weapons needs time to plan, it needs to be a necessity meaning there has to be a building up of a certain belligerent situation, that doesn't just come out of nowhere.