And if part of the administration's defense plan against rogue states includes boostphaseintercept -- being able to shoot down offensive missiles very early in their flight -- the system would incidentally also defend Russia.
Specifically, this would mean adapting the Navy's AEGIS fleet air defense system as quickly as possible to permit it to intercept long-range missiles, especially in the boost or ascent phase where geography permits (as in the case, for example, of North Korea and perhaps Iraq or Iran).