"In this Perspective, the authors urge strategists to consider a new concept for adapting U.S. grand strategy to the information age—noopolitik, which favors the use of “soft power”—as a successor to realpolitik, with its emphasis on “hard power.” The authors illuminate how U.S. adversaries are already deploying dark forms of noopolitik (e.g., weaponized narratives, strategic deception, epistemic attacks); propose ways to fight back; and discuss how the future of noopolitik might depend on what happens to the global commons—i.e., the parts of Earth that fall outside national jurisdictions and to which all nations are supposed to have access."