There's likely a difference between rural and urban parts of the same country as well in terms of preparedness. The less-prepared countries will likely also have very unevenly distributed population densities.
Very good point. Russia is a good example of this. Despite our economic embargoes / sanctions the majority of the population goes on without a beat. Some in big cities surely miss some things, but overall the Obama and Trump sanctions get shrugged off. China would suffer a lot more if the same sanctions were imposed.