User blog comment:Fegaxeyl/Discussion: What would happen in someone new used nukes in 1983:DD/@comment-4727448-20120819180335

Exactly what you said. Everyone would think no one would ever use nuclear weaponry again due to the horror and destruction of Doomsday. International condemnation is the correct answer, followed by international war with the USSR and emargoes, blockades, basically everything possible to beat the tar out of the Siberians.