A 9U CubeSat detector can identify a thermonuclear weapon on a satellite from 4 km away by observing spallation neutrons induced by GeV protons in roughly one week.
https://breakingdefense.com/2019/04/ the-stellar-dance-us-russia-satellites-make-potentially-risky-close-approaches/ (2019) 16
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Verification of the Outer Space Treaty with Cosmic Protons
A 9U CubeSat detector can identify a thermonuclear weapon on a satellite from 4 km away by observing spallation neutrons induced by GeV protons in roughly one week.