I visited a Soviet silo near Pervomaisk in Ukraine a few years ago. The guide, who had been a subcommander in the final crew, enthusiastically demonstrated how the Soviet standard (flagpole) that stood between the two luxuriously shock-absorbed command chairs could be used to turn both keys from one station - the slotted design in the top of it allows you to simply hook on and push. It was intended as an unofficial but official but unofficial failsafe, so a sole survivor could launch.
Their design was generally very different to US missile complexes - they usually had the command complex in a silo rather than a separate bunker, as they essentially put upended submarines on shock absorbers in them then concreted over the silo cap. Clever leveraging of existing R&D, and means you're just digging silos, and no complex structure.
Also, the Satan missile is a scary, and surprisingly huge, thing.