By including close allies in the deliberative process aimed at maintaining the security of space and cyber systems against hostile threats, US decision makers can forestall dissension among friendly capitals once military action is taken, and hopefully receive strong public backing from allied governments. Just as public disagreement with our allies might invite adventurism by an adversary, political and legal solidarity between the US and its allies can contribute to deterrence.
National Security Fundamentals in the Space and Cyber Domains — download PDF