The first nukes will probably be silo killers ground burst explosions and most of US silos are in the hearth farmland, if Russians nukes are more salted than expected you will have a lot of radioactive soil dust into air that will contaminate a huge portion of the US. And the same will be for Russia. And that is just the beginning. Then come industrial centers, military command centers, airfields, political center and finally after all of that then will be revenge nuking of cities and populations centers, the final objective will be genocide.