Some of the new technologies were intentionally limited to not upset MAD, such as MIRV technology that would allow a trivial amount of silos to hold enough nuke

Some of the new technologies were intentionally limited to not upset MAD, such as MIRV technology that would allow a trivial amount of silos to hold enough nukes for an effective counter-force first strike. Keeping limited nuclear armament technology is fine as long as all the world actors are honest about it