Theyve changed immeasurably. There hasn’t been another world war because to have another one would almost certainly mean everyone loses.
The tactics can be boiled down to “if they fire nukes, fire our nukes. If it looks like we might lose, fire our nukes”. Nuclear armageddon is the end result, so no nuclear powers want any kind of direct conflict with eachother. Proxy wars and information wars are the new conventional war
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