This paper examines how well future U.S. national and theater missile defense systems will have to perform to meet reasonable defense objectives as a function of the level of the threat. Deploying a thin U.S. national missile defense today is premature because the threat is not readily apparent, the United States can deter most threats, and the United States has some conventional counterforce options against a developing state's nascent ICBM arsenal.

However, if, or when, intercontinental ballistic missile threats appear, a defense with 100 interceptors deployed at one or two sites around the continental United States should be able to to intercept between 10 and 20 apparent warheads, assuming NMD systems can detect and track warheads with a probabilty above 0.99 and that NMD interceptors have a single-shot probability of kill (SSPK) against warheads between 0.35-0.65. Theater-range ballistic missiles present a greater near-term threat. The current THAAD program may provide an effective upper-tier defense, but only if it can achieve detection and tracking probabilities in the range 0.96-0.98 and interceptor SSPKs in the range 0.4-0.65 for threats with between 100-200 apparent warheads. Larger threats will require even higher technical performance.

Similarly, the current NTW program will require the same detection and tracking probability, but with interceptor SSPKs in the range of 0.55-0.80 to deal with the size of the threat.

Moreover, for these defenses to be truly useful, they must be accompanied by an equally effective lower tier, e.g., using PAC-3 terminal defenses. The main challenge for upper- and lower-tier defenses is responsive threats that use countermeasures such as decoys and chemical or biological submunitions. Airborne boost-phase theater missile defenses are relatively robust with respect to these countermeasures and they pose relatively little threat to the nuclear forces of the five major nuclear powers. Hence, more emphasis should be placed on such systems in current U.S. missile defense plans.

This report is a product of the Catastrophic Terrorism Study Group, a nine-month long collaboration of faculty from Harvard University, the Massachusetts Institute of Technology, Stanford University, and the University of Virginia. The Group involves experts on national security, terrorism, intelligence, law enforcement, constitutional law, technologies of catastrophic terrorism and defenses against them, and government organization and management.

The Group is co-chaired by Ashton B. Carter and John M. Deutch, and the project director is Philip D. Zelikow. Organized by the Stanford-Harvard Preventive Defense Project, the work of the Study Group is part of the Kennedy School of Government's "Visions of Governance for the Twenty-First Century" project, directed by Dean Joseph S. Nye, Jr. and Elaine Kamarck.

While the danger of catastrophic terrorism is new and grave, there is much that the United States can do to prevent it and to mitigate its consequences if it occurs. The objective of the Catastrophic Terrorism Study Group is to suggest program and policy changes that can be taken by the U.S. government in the near term, including the reallocation of agency responsibilities, to prepare the nation better for the emerging threat of catastrophic terrorism.

As Russia undergoes transition from a command to a market economy, almost all aspects of the economic landscape are changing. One of the more promising changes is the emergence of entrepreneurship. Entrepreneurship depends heavily in turn on the availability of financing and advice for new businesses. For the past several decades in the United States this help has come largely from venture capitalists, so it is logical to consider the role that venture capital can play in Russia. Some understanding of this role can be gleaned from reviewing the development of venture capital in the United States. This paper reviews this development and suggests ways of building and utilizing venture capital firms in Russia, recognizing that there are many differences between the circumstances in Russia and those surrounding the development of venture capital in the United States.

The majority of Russia's current strategic nuclear force will become obsolete shortly after the turn of the century. Hence, Russian strategic force modernization is essential if Russia is to remain a nuclear power on a par with the United States. Numerous uncertainties, especially financial uncertainties, prevent accurate estimates of Russia's future strategic force structure. Nevertheless, under the START I Treaty, Russia can probably maintain a force with slightly more than 4,000 strategic nuclear warheads over the next two decades-about half the number of the United States. Under START II, Russia is likely to maintain a strategic force of between 1,800 and 2,500 warheads, compared to 3,500 warheads for the United States. Therefore, Russia's main interest in ratifying the START II Treaty would be to pursue a START III Treaty that limits both sides to between 2,000 and 2,500 strategic nuclear warheads. This is the least expensive way to retain rough parity with the United States. Several reasons have been educed for why Russia should not ratify the START II Treaty, namely, because the Treaty allows a U.S. advantage in reconstitution capability and prompt hard-target-kill capability. However, these advantages are neither so great nor so consequential that Russia should reject the START II Treaty for these reasons alone. If Russia ratifies the START II Treaty, and presumably a follow-on START III Treaty, Russia's future strategic nuclear force will appear a lot different than its Soviet predecessor due to the reduced emphasis on land-based ICBMs. Nevertheless, the Russian force should remain a highly survivable, stable force-assuming Russian leaders allocate sufficient resources to ensure that their ballistic missile submarines, mobile ICBMs, and bombers can survive all plausible counterforce threats.

If high-performance computing (HPC) export control policy is to be effective, three basic premises must hold:

This study applies and extends the methodology established in Building on the Basics [1]. Its objective has been to study trends in HPC technologies and their application to problems of national security importance to answer two principal questions:

· Do the basic premises continue to be satisfied as the 20th century draws to a close?

· In what range of performance levels might an export-licensing threshold be set so that the basic premises are satisfied?

The study concludes that export controls on HPC hardware are still viable, although much weaker than in the past. In particular, while applications of national security interest abound, it is increasingly difficult to identify applications that strongly satisfy all three basic premises, i.e. are of extreme national security importance and would likely be effectively pursued by countries of national security concern and would be severely retarded without levels of computing performance that could be effectively controlled.

This report on non-binding, non-treaty approaches to arms control draws upon research and discussion at the Center for International Security and Arms Control during 1990 and 1991, after the Cold War had ended but before the disintegration of the Soviet Union. It was apparent at the time that the traditional approach to arms control--through detailed treaties resulting from long negotiations--might not be adequate to deal with the new situation in which arms reductions could be made quickly but coordination would still be needed in order to preserve stability. We examined the possibility of using reciprocal unilateral measures (RUMs) in place of treaties as a mechanism for achieving arms control.

A striking example of the approach we were recommending was when Presidents Bush and Gorbachev announced major withdrawals of non-strategic nuclear weapons in September and October 1991 (We describe the Bush-Gorbachev RUMs in this paper.) The strategic picture changed dramatically soon after those measures were announced. The Soviet Union was replaced by the Russian Federation and 14 other newly independent states. For several years, the treaty method worked well in U.S.-Russian arms control, alongside other forms of cooperation such as the Nunn-Lugar program. We put aside our work on RUMs.

Although we are far from a resumption of the Cold War, U.S.-Russian relations are no longer as cooperative as they were in the early 1990s. Besides, the treaty method has slowed almost to a standstill. We have therefore returned to the draft final report of 1991 and drawn from it the history we thought is relevant to the current problem of reducing the strategic nuclear threat Russia and the United States pose to each other--and to the rest of the world.

Future regional conflicts will almost certainly involve politically less stable nations or other regional actors using theater ballistic missiles armed with either nuclear, biological, or chemical warheads. The United States Air Force is attempting to deal with this threat by developing the Airborne Laser (ABL) with the goal of shooting down missiles while they are still under power and before they can release submunitions possibly containing highly toxic biological agents. This paper presents the results of an analysis of this system. It is based solely on information found in the open literature and using the basic physics and engineering involved in transmitting intense laser beams through the atmosphere. The ABL's potential capabilities and possible theaters of operation are discussed at a non-technical level.

Since Brazil and West Germany surprised the world by announcing that they had reached the nuclear "deal of the century" in 1975, many national and international observers have feared that Brazil sought to develop atomic weapons. Brazilian rejection of the Nuclear Non-Proliferation and Tlatelolco treaties, insistence on its legal right to develop so-called peaceful nuclear explosives (PNEs), aspirations to great power status, authoritarian military government, and tacit nuclear rivalry with Argentina aroused concern that this ambitious program of reactor construction and technology transfer would mask an effort to reach the bomb.

Although difficult financial circumstances derailed this program in the late 1970s, by the early 1980s press reports began to emerge indicating that a secretive "parallel" nuclear program under military direction was underway. Transition to democratic rule in 1985 failed to clarify the nature and objectives of this second effort, and provocative statements by senior military officers intensified concerns. This second effort persevered in the face of the severe economic conditions that made the 1980s a "lost decade" for Latin American countries, increasing international stress on nonproliferation, and protests from domestic anti-nuclear and environmental groups, as well as a 1990 investigation by the national congress.

By 1991, however, Brazil had formally renounced PNEs, agreed to establish bilateral safeguards with Argentina and to accept International Atomic Energy Agency (IAEA) inspection of formerly secret nuclear facilities, and committed to ratifying the Treaty of Tlatelolco. This marked the apparent reversal of a long trajectory toward the proliferation threshold, and thus assuaged apprehension within and outside the country. Yet military involvement in nuclear technological development continued essentially unaltered, and Brazil now enjoys the distinction of being one of the few states with the indigenous capacity to produce fissile material necessary to construct atomic weapons.

This paper seeks to answer two questions: Given limited resources and domestic and foreign opposition, how did the Brazilian military succeed in developing this capacity? Given their determined effort and enduring role in nuclear development, why did the armed forces stop short of the bomb?

This study answers these two questions through investigation of domestic political processes, which involve the formation and maintenance of programmatic coalitions that marshal human, material, and political resources for technological development. Such coalitions encounter constraints which include competition for scarce human and financial capital, international technological denial, and domestic and international opposition. Such programs must be either effectively insulated from domestic challenges, or politically defended and normatively legitimated in spite of them.

By the end of 1995, China had built the world's ten largest telecommunications networks and the industry was growing at a faster rate than any other sector of the booming Chinese economy. For example, the country's 40 million telephone subscribers with 50 million telephone numbers represented an average annual growth rate of nearly 100 percent over a ten-year period. Internet users served by ChinaNet jumped from 6,000 in 1995 to 53,739 in March 1997. Progress was qualitative as well, as China procured state-of-the-art fiber-optic and satellite technologies and narrowed the gap between itself and the United States and between its own urban and rural areas. The achievement can be attributed to the government's commitment to telecommunications as the key to further development--a commitment backed by preferential policies; to foreign financial and technical support; and to changing attitudes of the Chinese people themselves.

However, China faces some major problems. The gap in living standards between coastal and interior provinces is widening, as people migrate from poor villages to increasingly affluent cities. The government must focus more on developing isolated regions. Rapid development of telecommunications cannot be sustained under a government monopoly, which aids the government's economic and security interests but discourages foreign companies from investing and transferring technology. At the same time, there has been little headway in developing domestic telecommunications products. Management of the industry is chaotic in the absence of clear regulations, and a multilayered bureaucracy encourages wasted resources, duplication, red tape, and corruption. Political problems are likely to emerge as telecommunications continues to help open Chinese society and young Chinese come to embrace Western industrial culture.

Nevertheless, China is destined to become and remain the world's "super market" as long as it remains politically stable in its transition from a plannned to a market economy. Telecommunications will continue to play a key role during this transition.