Growing Sino-Russian coordination necessitates greater security cooperation between US Allies in Europe and East Asia. US Allies in both regions face remarkably similar threats requiring similar operational concepts, capabilities, and technologies. Further, these Allies must hedge against the specter of US abandonment. An exploration of the links between the two geographically distant US Alliance networks illustrates the Allies’ perspectives on US extended deterrence and highlights opportunities to devise better policies for cooperation. Read the article: https://press.armywarcollege.edu/parameters/vol51/iss2/7/