Tong Zhao
Tong Zhao is a fellow in Carnegie’s Nuclear Policy Program based at the Carnegie–Tsinghua Center for Global Policy.
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Traditionally, within the Chinese strategic community, strategic stability constituted a comprehensive concept for describing the overall stability of a bilateral relationship that was affected by a wide range of factors—military, political, diplomatic, and economic. In recent decades, the Western literature on nuclear weapons and deterrence issues has started to be introduced to and embraced by the Chinese strategic community. As a result, Chinese experts are increasingly using the term “strategic stability” to refer to a bilateral nuclear relationship of mutual vulnerability. Maintaining such a mutually vulnerable relationship with other major nuclear powers, especially the United States, is of ultimate importance for Chinese decisionmakers. However, despite Beijing’s efforts to enhance its nuclear retaliatory capability through modernization programs, it sees itself facing significant new challenges.

The emergence of advanced conventional weapons is widely recognized as one of the major challenges to strategic stability in the so-called second nuclear age. Such conventional weapons can travel at extremely high speeds and strike targets with extraordinary accuracy. Among all conventional military capabilities, hypersonic weapons present perhaps the greatest challenge. These types of weapons, which are currently under development in both the United States and China, can potentially travel long distances at speeds of more than Mach 5, and they have a much greater capability to change flight trajectory than ballistic missiles. This emerging conventional military technology is potentially capable of disrupting mutually vulnerable relationships between nuclear powers by blurring the lines between conventional and nuclear warfare.

The United States has the most advanced hypersonic technology development program, and it has expressed interest in deploying such weapons. According to the Obama administration’s 2010 Nuclear Posture Review Report, for instance, conventional weapons are slated to play a more important role in the U.S. deterrence posture. Hence, the US investment in the development of hypersonic weapons is causing major Chinese concerns.

This chapter draws directly on the Chinese literature to answer these questions: What are China’s specific concerns about hypersonic weapons? How do Chinese experts expect hypersonic technologies to alter future nuclear relationships and, therefore, affect traditional understandings of strategic stability? Also, what are the major mutual misunderstandings regarding each other’s hypersonic technology development, and what are the implications for maintaining U.S.-China strategic stability in the future?

This is the introduction to the author’s chapter in the forthcoming book The End of Strategic Stability? Nuclear Weapons and the Challenge of Regional Rivalries