DD-HTRN: "Russian nuclear weapons, like American ones, have coded interlocks that prevent their detonation by a crazed individual within the Russian military itself, much less anyone who might steal one"
"BUT, anyone who manages to spirit away such a bomb would presumably be able to partially dismantle it and hack into the code system at leisure... the bomb code is only meant to prevent the bomb being exploded while it remains in situ."
Weren't sub-based missiles launchable by the captain, with the other key held by the KGB political officer? Granted, I'm getting that idea from "The Hunt for Red October", but supposedly Clancy got high marks for accuracy.