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1. Averting AI Armageddon: U.S.-China-Russia Rivalry at the Nexus of Nuclear Weapons and Artificial Intelligence

Author:
Jacob Stokes, Colin H. Kahl, Andrea Kendall-Taylor, and Nicholas Lokker
Publication Date:
02-2025
Content Type:
Special Report
Institution:
Center for a New American Security (CNAS)
Abstract:
In recent years, the previous bipolar nuclear order led by the United States and Russia has given way to a more volatile tripolar one, as China has quantitatively and qualitatively built up its nuclear arsenal. At the same time, there have been significant breakthroughs in the field of artificial intelligence (AI) technologies, including for military applications. As a result of these two trends, understanding the AI-nuclear nexus in the context of U.S.-China-Russia geopolitical competition is increasingly urgent. There are various military use cases for AI, including classification models, analytic and predictive models, generative AI, and autonomy. Given that variety, it is necessary to examine the AI-nuclear nexus across three broad categories: nuclear command, control, and communications; structural elements of the nuclear balance; and entanglement of AI-enabled conventional systems with nuclear risks. While each of these categories has the potential to generate risk, this report argues that the degree of risk posed by a particular case depends on three major factors: the role of humans, the degree to which AI systems become a single point of failure, and the AI offense-defense balance. As Russia and China increasingly aim to modernize their nuclear arsenals and integrate AI into their militaries, it is essential for policymakers to be aware of the risks posed by the AI-nuclear nexus. Dealing with China and Russia on issues at this nexus is likely to be difficult in the current diplomatic and military context, characterized by increasingly strained bilateral relationships between the United States and both China and Russia, along with an uptick in coordination between Beijing and Moscow. Nonetheless, there are still various steps that U.S. policymakers could take to bolster deterrence and stability with respect to these issues. These include: building knowledge and competency around issues at the AI-nuclear nexus; integrating AI into diplomatic initiatives related to nuclear and other strategic risks, and vice versa; establishing and promoting norms for the safe use of AI in relation to nuclear arsenals and other strategic capabilities; developing policy and technical criteria for assessing exactly how and when to keep humans in the loop on all nuclear-related processes; including AI technologies as a factor in oversight and reviews of the U.S. nuclear arsenal; investing in AI-enabled cyber and space capabilities to enhance defense and resilience, reduce incentives to attack those areas, and mitigate entanglement risks; consulting closely with U.S. allies about how AI will shape extended deterrence calculations related to both nuclear and conventional capabilities; and pursuing a comprehensive set of risk reduction and crisis management mechanisms with China and Russia while recognizing the obstacles to progress. Failing to take these steps could leave the country and the world dangerously exposed to risks and ill-prepared to seize any opportunities arising from the increasingly salient AI-nuclear nexus.
Topic:
Defense Policy, Nuclear Weapons, Cybersecurity, Artificial Intelligence, and Rivalry
Political Geography:
Russia, China, Asia, North America, and United States of America

2. Assessing China’s Nuclear Decision-Making: Three Analytical Lenses

Author:
Jacob Stokes
Publication Date:
03-2025
Content Type:
Special Report
Institution:
Center for a New American Security (CNAS)
Abstract:
China’s rapid nuclear buildup is raising questions about how the country makes decisions related to nuclear weapons. This policy brief analyzes that trend by presenting three overarching analytical lenses, or categories of factors, that shape Beijing’s nuclear decision-making: leadership, weapons systems and military organizations, and official policies and doctrine. On leadership, Chinese Communist Party General Secretary Xi Jinping likely sees nuclear weapons granting prestige and growing in relevance, but his views on nuclear weapons’ efficacy are less clear. On weapons systems and military organizations, the expansion of China’s nuclear arsenal provides the country’s leaders with new options, which could shift those leaders’ intentions over time. Implementation of those options, though, runs through often-corrupt People’s Liberation Army military organizations. On official policies and doctrine, Beijing possibly sees its professed stance as a country that does not engage in U.S.- and Russian-style arms buildups as a source of diplomatic influence, particularly in the developing world or Global South. Separately, the circumstances where China’s nuclear no-first-use policy would face a true test—for example, during a major Taiwan contingency—are precisely the moments when Beijing would have massive incentives to selectively interpret or simply abandon that policy. In the near term, China’s official nuclear weapons policies will likely stay the same, so the gap between rhetoric and action will grow. A bigger arsenal and more nuclear rhetoric and signaling will, over time, also shape future Chinese coercion campaigns. In response, U.S. policymakers should commission an intelligence assessment of Xi’s views of specific nuclear crises, pressure China to issue more explanation of its nuclear policies and capabilities, and expand information sharing about missile tests on a reciprocal basis. U.S. policymakers should also make an authoritative policy statement on what would constitute China reaching nuclear parity with the United States and counter China’s nuclear buildup using both conventional and nuclear capabilities.
Topic:
Security, Foreign Policy, Defense Policy, Nuclear Weapons, and Decision-Making
Political Geography:
China, Asia, and United States of America

3. Atomic Strait: How China’s Nuclear Buildup Shapes Security Dynamics with Taiwan and the United States

Author:
Jacob Stokes
Publication Date:
02-2023
Content Type:
Special Report
Institution:
Center for a New American Security (CNAS)
Abstract:
This report examines the intersection of China’s nuclear modernization and cross-Strait tensions, especially how they might play out during a crisis, contingency, or conflict involving China, Taiwan, and the United States. Beijing is rapidly modernizing its nuclear arsenal to make it larger and more sophisticated. Changes include an increase in warhead numbers from more than 400 today to potentially 700 by 2027 and more beyond, consolidating a nuclear triad, developing new delivery systems, and digging at least 300 new missile silos. Some factors still could constrain the growth of China’s arsenal or the policies that shape the way Chinese leaders employ it. They range from fissile material stocks to competing military spending priorities, considerations about China’s international reputation, and upholding Beijing’s claimed No First Use policy. But nearly all those constraining factors either already have weakened or could do so in the near future. China’s expanding nuclear arsenal suggests that the force will be designed to fulfill new missions. Some part of Beijing’s buildup surely is meant to bolster its second-strike retaliatory capability in the face of what China perceives as shifts in U.S. conventional and nuclear capabilities and policies. China’s long-term goal for the expansion, however, could be more ambitious and potentially even include seeking to build an arsenal on par with Washington’s and Moscow’s. Meanwhile, China continues to ramp up pressure on Taiwan using political, economic, and military tools. Beijing’s campaign could provoke more crises in the coming years. The three major roles that nuclear weapons could play for China when dealing with cross-Strait crises or conflicts are: to shield China from U.S. nuclear coercion, to threaten Chinese nuclear use to try to forestall U.S. intervention, and to conduct a limited Chinese nuclear detonation in an attempt to force U.S. and Taiwanese capitulation. The report concludes with recommendations for U.S. policymakers. It calls for carrying out U.S. nuclear modernization plans to deter China but avoiding nuclear arms racing as a strategy in itself. It recommends incorporating nuclear elements into contingency planning and scenario exercises related to Taiwan, both unilaterally and with allies and partners. The report then calls for improving Taiwan’s conventional military capabilities while maintaining a consistent U.S. policy on cross-Strait issues and ensuring Taiwan forgoes pursuing indigenous nuclear weapons. Finally, the report argues in favor of pushing forward tough-minded bilateral engagement with Beijing on strategic stability and security issues while crafting a multilateral arms control strategy that builds coalitions to incentivize China to join and impose costs on Beijing if it opts to stay outside of key agreements.
Topic:
Security, Defense Policy, Nuclear Weapons, and Regional Security
Political Geography:
China, Taiwan, Asia, North America, and United States of America

4. Strengthening the Shield: Japan’s Defense Transformation and the U.S.-Japan Alliance

Author:
Jacob Stokes, Lisa Curtis, Joshua Fitt, Joseph I. Grimm, and Rebecca Wittner
Publication Date:
09-2023
Content Type:
Special Report
Institution:
Center for a New American Security (CNAS)
Abstract:
In December 2022, Japan’s government released three major strategic documents: the National Security Strategy, the National Defense Strategy, and the Defense Buildup Program. Although Japan has made incremental changes to its security policies and capabilities over the last decade, the new documents mark a notable shift in Japan’s approach to strengthening its defense. The documents reflect Tokyo’s assessment of the rising threats that could challenge Japan’s security and signal Japan’s commitment to build the military capabilities necessary to meet them. This report examines Tokyo’s defense transformation and assesses its implications for the U.S.-Japan alliance and Washington’s strategy toward the Indo-Pacific. Japan is “fundamentally reinforcing” its national security and defense policies to cope with its increasingly severe security environment. The military threats posed by China, North Korea, and Russia have been growing steadily for years but appear to be peaking simultaneously. Tensions between Japan and China have occasionally flared in the five decades since they normalized diplomatic relations. But those tensions have reached new heights since 2012, when China began to regularly contest Japan’s administration of the Senkaku/Diaoyu Islands. By August 2022, Beijing fired five ballistic missiles into Japan’s exclusive economic zone during China’s live-fire military exercises after then-U.S. House Speaker Nancy Pelosi’s visit to Taiwan. The aim of the missile launches was to signal there would be consequences for Japan if Tokyo were to intervene in a Taiwan contingency. Meanwhile, North Korea’s unprecedented rate of missile testing since 2022 and Russia’s brutal war against Ukraine have deepened Japanese concerns about the potential for the use of force in the Indo-Pacific. Japan is taking steps to improve its ability to defend itself and deter an invasion, including through changes to security funding and policy. Tokyo has announced plans to increase its defense spending by 65 percent over the next five years, acquire standoff weapons that could be used for a counterstrike mission, and adopt an “active cyber defense” posture. Japan has clarified the roles of its military, the Self-Defense Forces (SDF), and Coast Guard in the event of an attack; committed to establishing a permanent Joint Headquarters for SDF operations; and created a program for supplying partner militaries with security assistance. Effectively employing counterstrike and active cyber defense, however, will require a clearer delineation of the legal authorities for their use as well as the overall military strategies that they would support. In addition, pressure from the Japanese public over tax hikes required to pay for the defense spending increase amid other fiscal pressures could pose a barrier to implementation. Japan plans to strengthen the SDF through boosting readiness and resilience of current forces, acquiring counterstrike and other advanced capabilities, and improving force posture and mobility. The SDF has been plagued by a chronic lack of munitions and other supplies, and most of its facilities do not meet its own standards for resilience against enemy attack. Addressing these shortfalls is essential, though these types of programs often lose out to more high-profile programs. For its counterstrike mission, Japan has announced it will buy U.S.-made Tomahawk cruise missiles. This initial purchase will provide a stopgap until Japan is able to produce its own longer-range missiles later in the decade. Japan has also announced it will pursue new capabilities in uncrewed systems, space, cyber, and artificial intelligence (AI). But fulfilling these ambitions will be challenging given some short-falls in Japan’s technology base and SDF personnel. Lastly, the SDF is grappling with how to expand its forces in Japan’s southwest islands while maintaining a sufficient presence throughout the country to deter aggression from a range of possible threats. Next, Japan’s strategy emphasizes enhancing security partnerships regionally and across the globe. Japan has recently stepped up its defense cooperation with several Indo-Pacific and European countries. With Australia, Japan is building on a 10-year effort to deepen strategic cooperation, a process that culminated in January 2022 with the completion of a Reciprocal Access Agreement. New bilateral strategic cooperation includes enhancing interoperability between the SDF and the Australian military, increasing rotational SDF training deployments to Australia, and announcing a new joint security declaration that commits to a combined response to military contingencies. Similarly, Japan has long recognized the strategic importance of India and continues to build on the Japan-India relationship through maritime security cooperation, a new joint fighter exercise, and operationalization of their Acquisition and Cross-Servicing Agreement. Japan and the Philippines are also expanding their defense ties through humanitarian assistance and disaster relief training exercises and an important emerging trilateral security relationship with the United States. Over the past year, Japan and South Korea have made significant strides to repair relations since the latest downturn that began in 2018. This will be an incremental process, but there has been progress in the form of leader-level summits and ministerial dialogues, plans to cooperate on sharing data about North Korean missiles, and new trilateral ballistic missile and anti-submarine drills with the United States. Japan also is building defense connections and relationships with European nations. It is pursuing the development of a sixth-generation fighter jet with the U.K. and Italy and, particularly since the full-scale Russian invasion of Ukraine, has sought to deepen strategic ties with NATO. These comprehensive changes to Japan’s defense policies will necessarily reshape the military and security pillars of the U.S.-Japan alliance. Tokyo’s acquisition of counterstrike capabilities will position Japan to potentially take on some offensive tasks, even while retaining its primarily defensive orientation. This also has implications for alliance contingency planning related to defending Japan directly as well as around Taiwan, the Korean Peninsula, and the South China Sea. However, increased joint planning will require updates to alliance command and control (C2) and information-sharing mechanisms. Additionally, given resource constraints, the alliance would be well-served to find additional opportunities for military technology sharing, codevelopment, and coproduction, such as through Japanese involvement in the second pillar of the AUKUS (Australia-United Kingdom-United States) partnership focused on cooperation on advanced capabilities and defense technology innovation. And the alliance must take steps to improve force posture and readiness, including through enhancing base resiliency and increasing munitions stockpiles. Japan’s fundamental transformation of its defense posture will mean significant changes for the U.S.-Japan alliance. The United States must adapt its approach to alliance coordination to maximize new opportunities and manage any new challenges. In this context, U.S. policymakers should: Prepare to update the alliance, while recognizing that Japan’s new defense policies will require significant time, resources, and political will to implement. Stay closely aligned with Tokyo on the threat land- scape as well as engagement with geopolitical competitors, especially China. Integrate U.S.-Japan command and control structures. Create an alliance readiness, resilience, and posture implementation task force. Deepen planning for contingencies and bolster extended deterrence. Create a road map for expanding defense technology cooperation concurrently with Japan’s implementation of specific improvements to its information security practices and infrastructure. Innovate operational concepts for uncrewed systems and counterstrike capabilities. Leverage the U.S.-Japan alliance as a hub for minilateral and multilateral security engagement. Build U.S.-Japan alliance mechanisms that will expand cooperation on cyber security and defense. Stand up an alliance dialogue on military personnel issues.
Topic:
Defense Policy, National Security, Bilateral Relations, and Alliance
Political Geography:
Japan, Asia, and United States of America

5. Resisting China’s Gray Zone Military Pressure on Taiwan

Author:
Jacob Stokes
Publication Date:
12-2023
Content Type:
Special Report
Institution:
Center for a New American Security (CNAS)
Abstract:
The People’s Republic of China (PRC or China) has sharply escalated its pressure campaign targeting the Republic of China (ROC or Taiwan) in recent years. Beijing appears likely to use Taiwan’s upcoming presidential election in January 2024 as a pretext to apply more pressure on the self-governing island, particularly in the “gray zone” using China’s military, the People’s Liberation Army (PLA), along with other tools of state power. There is no precise and commonly agreed upon definition of what gray zone activities are and are not. In general, though, the concept refers to actions that fall into the space between, on one side, peace and, on the other, full-scale kinetic war.1 Gray zone activities are coercive and aggressive but designed to stay below the threshold of triggering major conflict. China uses gray zone operations as part of a comprehensive strategy to pressure Taiwan that spans the areas of diplomacy, information, economics, and security. This policy brief examines one major component of that campaign: gray zone military and security operations. It starts by detailing the capabilities and tactics China uses to put security pressure on Taiwan. Then, it explains what Beijing seeks to achieve with those actions. The paper concludes with recommendations for how U.S. and Taiwan policymakers can resist and counter China’s gray zone operations.
Topic:
Security, Foreign Policy, Defense Policy, Diplomacy, Economics, Military Affairs, and Information
Political Geography:
China, Taiwan, and Asia

6. Operationalizing the Quad

Author:
Lisa Curtis, Jacob Stokes, Joshua Fitt, and Andrew J. Adams
Publication Date:
06-2022
Content Type:
Special Report
Institution:
Center for a New American Security (CNAS)
Abstract:
This paper assesses Quad activities and the progress the group has made toward its stated objective of promoting a free and open Indo-Pacific. It also provides policy recommendations for strengthening Quad cooperation across the six identified priority areas (vaccines, critical and emerging technologies, climate change, infrastructure, space, and cybersecurity) as well as on trade and economics and security and defense.
Topic:
Security, Defense Policy, International Cooperation, Science and Technology, Economy, Trade, and Quad Alliance
Political Geography:
Japan, India, Australia, United States of America, and Indo-Pacific