[Question] How much does the risk of dying from nuclear war differ within and between countries?

It seems that being in a major city such as London or New York makes it much more likely that one dies in case of nuclear war than in the countryside or in a smaller town.
Also, some people seem to think that certain countries are much safer from nuclear war than others (e.g., compare New Zealand to the US), which also makes sense.
What seems much less clear to me is how large the difference in risk really is.

  1. How would you model the probability of dying from nuclear war as a function of the distance from a major city in Europe or the US?

  2. How would you estimate the a priori difference in risk of dying from a nuclear war between the highest and lowest-risk countries? Which are those countries?

    I very much appreciate being linked to any resources that are useful for answering this question!

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