You are referring to the concept of MAD... The anti-missile missile based from what I've read on the Standard-2er or an enhanced Patriot doesn't have the range to take out any Russian - based system save anything in Kaliningrad - and there the reaction time is too minimal - not to mention that the ground-based monitoring/guidance systems are located some distance south. In any-case the effective Russian ballistic missile retaliatory components of MAD are submarine-based. It's a straw argument - tempest in the teapot.