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by burnt-resistor 16 days ago
Mid-course phase interception: Ground-Based Midcourse Defense (GMD), Glide Phase Interceptor (GPI), SM-3, or 300+ kW laser.

Terminal phase interception (It's moot using ABMs because of MIRV and decoys): (A missile similar to Sprint (but conventional) or Sentinel) or 300+ kW laser would be required to intercept a Mach 10-30 target. ABMD (SM-2 and SM-6) and THAAD aren't fast enough. If one had a lot of 1 MW class lasers that could serially engage many targets, that could work.

The other problem, as mentioned, is having radar(s) that can search and track HGVs and ballistic targets upwards of Mach 20-30 (7+ km/s).