Debating the U.S. Nuclear Deterrence Gap with Russia and China

Some U.S. nuclear strategists, military officers, and lawmakers believe that the United States is facing a 'deterrence gap' with Russia and China. This belief stems from the presence of theater-range nuclear weapons in both countries, particularly Russia, which are thought to lower the threshold for nuclear use. The perceived lack of similar capabilities in the U.S. is believed to hinder Washington's ability to respond effectively to limited nuclear strikes, potentially encouraging adversaries to escalate conflicts.

Concerns about deterrence gaps are not new. In the 1960 presidential campaign, John F. Kennedy criticized the Eisenhower administration for a supposed 'missile gap' with the Soviet Union, which was later revealed to be unfounded. Similarly, in the 1970s, the myth of a 'window of vulnerability' due to Soviet missile accuracy led to calls for a massive U.S. nuclear buildup.

The search for deterrence gaps has created a cycle where defense analysts and think tanks seek out perceived weaknesses in U.S. deterrence, often leading to new weapons programs. U.S. officials frequently express concerns about vulnerabilities, which may ignore Russian and Chinese perspectives on their own deterrent capabilities. For instance, both adversaries cite U.S. ballistic missile defenses as a factor driving their military modernization.

Adm. Charles Richard, former commander of U.S. Strategic Command, publicly stated that he believes a deterrence gap exists due to the conflict in Ukraine and China's nuclear advancements. His advocacy for low-yield, non-ballistic nuclear systems reflects the perceived need to address this gap. Critics argue that such admissions could reinforce adversary beliefs about U.S. weaknesses, complicating the strategic landscape.

The push for new nuclear weapons raises concerns about the credibility of U.S. deterrence. Advocates argue that low-yield theater weapons are necessary to respond to non-strategic nuclear attacks, but this perspective may overlook the existing options available to the U.S. military. The principle of proportionality in nuclear response has become a cornerstone of U.S. doctrine, but it may inadvertently restrict decision-making in a crisis.

The historical context of U.S. nuclear strategy reveals a tendency to exaggerate vulnerabilities to justify new weapons programs. Past instances, such as the debate over the Reliable Replacement Warhead, demonstrate the risks of alarmist rhetoric that can undermine confidence in U.S. nuclear capabilities. The current anxiety surrounding low-yield nuclear weapons may similarly harm U.S. strategic credibility.

Moreover, the assumption that U.S. leaders will adhere strictly to principles of proportionality in nuclear conflict lacks historical precedent. Adversaries may misjudge U.S. resolve based on public discussions of vulnerabilities, leading to dangerous miscalculations. U.S. strategists are urged to focus on existing capabilities rather than creating new narratives of deterrence gaps that could mislead both allies and adversaries.