The United States is entering a period of intensifying strategic competition with several rivals, most notably Russia and China. U.S. officials expect this competition to be played out primarily below the threshold of armed conflict, in what is sometimes termed the gray zone between peace and war. In this report, the authors examine how the United States might respond to Russian and Chinese efforts to seek strategic advantage through coercive actions in the gray zone, including military, diplomatic, informational, and economic tactics. The United States is ill prepared and poorly organized to compete in this space, yet the authors' findings suggest that the United States can begin to treat the ongoing gray zone competition as an opportunity more than a risk. Moreover, leaders in Europe and Asia view Russian and Chinese gray zone aggression as a meaningful threat and are receptive to U.S. assistance in mitigating it. In this report, the authors use insights from their extensive field research in affected countries, as well as general research into the literature on the gray zone phenomenon, to sketch out the elements of a strategic response to the gray zone challenge and develop a menu of response options for U.S. officials to consider.

China’s maritime “gray zone” operations represent a new challenge for the U.S. Navy and the sea services of our allies, partners, and friends in maritime East Asia. There, Beijing is waging what some Chinese sources term a “war without gunsmoke.” Already winning in important areas, China could gain far more if left unchecked. One of China’s greatest advantages thus far has been foreign difficulty in understanding the situation, let alone determining an effective response. With contributions from some of the world’s leading subject matter experts, this volume aims to close that gap by explaining the forces and doctrines driving China’s paranaval expansion, operating in the “gray zone” between war and peace. The book covers China’s major maritime forces beyond core gray-hulled Navy units, with particular focus on China’s second and third sea forces: the “white-hulled” Coast Guard and “blue-hulled” Maritime Militia. Increasingly, these paranaval forces, and the “gray zone” in which they typically operate, are on the frontlines of China’s seaward expansion.

Few studies have systematically tracked how China is using gray zone tactics-coercive activities beyond normal diplomacy and trade but below the use of kinetic military force-against multiple U.S. allies and partners. Lacking a foundational empirical baseline, it is difficult to determine patterns and trends in Chinese activities to develop effective counters to them. The authors developed a framework to categorize China's use of gray zone tactics against five U.S. allies and partners in the Indo-Pacific and to identify the most problematic People's Republic of China (PRC) tactics that the United States could prioritize countering. Based on open-source material, this report provides a more in-depth understanding of Chinese operations in the gray zone. Among other conclusions, the authors observe that China views gray zone activities as natural extensions of how countries exercise power. China employs such tactics to balance maintaining a stable, favorable external environment with efforts to alter the status quo in China's favor without triggering major pushback or conflict. It has used nearly 80 such tactics on its neighbors, often in relation to territorial disputes.

The United States is being confronted by the liabilities of its strength. Competitors are finding avenues for threatening U.S. interests without triggering escalation. Their approaches lie in the contested arena between routine statecraft and open warfare—the "gray zone." The United States has yet to articulate a comprehensive approach to deterring competitors in the gray zone. A concrete and actionable campaign plan is needed to deal with the gray zone challenge; in order to do so, the United States must identify and employ a broad spectrum of tools and concepts to deter, and if needed, to compete and win contestations in the gray zone.

Geopolitical competition is increasingly playing out in the space beyond diplomacy and short of conventional war, sometimes referred to as the gray zone, which is forcing the United States to confront the liabilities of its strengths. This report assesses current U.S. government actions to deter, campaign through, and respond to competitors’ gray zone tactics. Using the campaign planning framework established in By Other Means Part I, it also provides recommendations aimed at ameliorating U.S. liabilities and building on its asymmetries to improve U.S. national security in the presence of rivals’ gray zone approaches.

"Discussions of an emerging practice of 'gray zone' conflict have become increasingly common throughout the U.S. Army and the wider national security community, but the concept remains ill-defined and poorly understood. This monograph aims to contribute to the emerging dialogue about competition and rivalry in the gray zone by defining the term, comparing and contrasting it with related theories, and offering tentative hypotheses about this increasingly important form of state competition. The idea of operating gradually and somewhat covertly to remain below key thresholds of response is hardly new. Many approaches being used today -- such as support for proxy forces and insurgent militias -- have been employed for millennia. The monograph argues that the emergence of this more coherent and intentional form of gray zone conflict is best understood as the confluence of three factors. Understood in this context, gray zone strategies can be defined as a form of conflict that pursues political objectives through integrated campaigns; employs mostly nonmilitary or nonkinetic tools; strives to remain under key escalatory or red line thresholds to avoid outright conventional conflict; and moves gradually toward its objectives rather than seeking conclusive results in a relatively limited period of time. Having examined the scope and character of gray zone conflict, the monograph offers seven hypotheses about this emerging form of rivalry. Finally, the monograph offers recommendations for the United States and its friends and allies to deal with this challenge"--Publisher's web site.