Russia-Ukraine

The population of Milwaukee is 561,385. The entire population of Wisconsin is 5.911 million at the time of writing this. Severe thermal damage would extend out about a mile.

Wow... what a terrible thing to think about. Yet it is at the top of many people's minds. Newsweek used maps made by a professor and historian named Alex Wellerstein to determine the impact of a Russian nuclear strike using their most powerful missile. So, if you're looking for nuke results from a different country... they would most likely look pretty similar.