I dont see every country as being nuked - you can have a lot of damage just from a country coming apart at the seams - for proof look at the rolling ball of fun that is today's Somalia for instance
just rioting and panic from the expectation of being nuked could be more than enough to really screw things up - and add in some fun things like major forest fires/crop failure/sabotage attacks and you could really not be in a good place very quickly
however there are definitely targets for nukes in Australia even if all you did was go after the US tracking stations that are in the country
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