BTW, to make a really strong nuclear strike we need more delivery systems. Cheap, fast and hidden (or disgusted as civilian units).
Something like this old project:
Great, one way suicide missions. Under cover of a civilian airliner.
And in case you were not aware, we retired the last of our Tomahawk BGM-109A nuclear missiles about a decade ago. The only ones we have now are conventional missiles.
And with ICBM missiles, there is really not much need for "more delivery systems". Our conventional bomber fleets have largely been converted to conventional use, but we will maintain enough for the use in a limited strike.
And the biggest threat for a nuclear war is not the US, Russia, or China. None of those nations is threatening their neighbors or others with nuclear destruction. Even India and Pakistan are pretty calm in that area. No, the biggest threat by far is the rogue nations, like North Korea and Iran.