Caporegime
I'm just saying hypothetically as we really don't know Russian or our own full capability but on paper at least, the nukes would saturate any defences, just have to hope that their nukes are as functional as everything else about them
For what it is worth, the US military claim that they can shoot down every nuke launched against them. This claim does not seem widely believed, but it is likely that the overwhelming majority of nukes launched by Russia wouldn't reach targets on US soil. And while Russia has 5k or so nuclear warheads, the number it can actually has ready to launch before it gets annihilated by the counterstrike is much smaller. A nuclear war between with Russia probably won't be the global end horror story oft portrayed, but it will still be an unimaginably severe global tragedy.