Why do countries deploy nuclear weapons abroad? Since 1945, more than twenty states have hosted foreign nuclear weapons on their territory, and five countries continue to do so today. These deployments have important consequences for international security, yet there is little systematic research about the factors that drive them. In this article, we develop three broad theoretical frameworks to explain why foreign nuclear deployments occur. Using a new data set of foreign nuclear deployments between 1945 and 2000, we find that two factors weigh heavily in driving these deployments: the protection of allies and the projection of military power. Nonproliferation motives, however, appear to play little role. The results carry important implications for our understanding of the causes of proliferation and the sources of nuclear posture.
AFP (Agence France-Presse). 2012. “US Lawmakers Back Nuclear Weapons near N. Korea.” May 18.
2.
AllisonGrahamZelikowPhilip. 1999. Essence of Decision: Explaining the Cuban Missile Crisis. 2nd ed. New York: Longman.
3.
Ben-PorathElchananDekelEddie. 1992. “Signaling Future Actions and the Potential for Sacrifice.”Journal of Economic Theory57 (1): 36–51.
4.
BleekPhilipp C.2010. “Why Do States Proliferate? Quantitative Analysis of the Exploration, Pursuit, and Acquisition of Nuclear Weapons.” In Forecasting Nuclear Proliferation in the 21st Century: The Role of Theory, edited by PotterWilliam C.MakhatzhanovaGaukar, 159–92. Stanford, CA: Stanford University Press.
FuhrmannMatthew. 2012. Atomic Assistance: How “Atoms for Peace” Programs Cause Nuclear Insecurity. Ithaca, NY: Cornell University Press.
14.
FuhrmannMatthewBerejikianJeffrey D.. 2012. “Disaggregating Noncompliance: Predation versus Abstention in the Nuclear Nonproliferation Treaty.”Journal of Conflict Resolution56 (3): 355–81.
15.
FuhrmannMatthewSechserTodd S.. Forthcoming. “Signaling Alliance Commitments: Hand-tying and Sunk Costs in Extended Nuclear Deterrence.”American Journal of Political Science.
16.
GartzkeErikKaplowJeffreyMehtaRupal. 2014. “The Determinants of Nuclear Force Structure.”Journal of Conflict Resolution58 (3): 481–508.
17.
GartzkeErikKroenigMatthew. 2014. “Nuclear Posture, Nonproliferation Policy, and the Spread of Nuclear Weapons.”Journal of Conflict Resolution.
GleditschNils PetterWallensteenPeterErikssonMikaelSollenbergMargaretaStrandHåvard. 2002. “Armed Conflict 1946–2001: A New Dataset.”Journal of Peace Research39 (5): 615–37.
20.
HorowitzMichael C.NarangNeil. 2014. “Are Nuclear, Biological, and Chemical Weapons Substitutes? Comparing the Determinants of WMD Proliferation.”Journal of Conflict Resolution.
21.
HuthPaul K.1990. “The Extended Deterrent Value of Nuclear Weapons.”Journal of Conflict Resolution34 (2): 270–90.
22.
HymansJacques C.2006. The Psychology of Nuclear Proliferation: Identity, Emotions, and Foreign Policy. Cambridge: Cambridge University Press.
23.
JervisRobert. 1984. The Illogic of American Nuclear Strategy. Ithaca, NY: Cornell University Press.
24.
JoDong-JoonGartzkeErik. 2007. “Determinants of Nuclear Weapons Proliferation.”Journal of Conflict Resolution51 (1): 167–94.
25.
KissingerHenry. 1957. Nuclear Weapons and Foreign Policy.
26.
KleinJamesGoertzGaryDiehlPaul. 2006. “The New Rivalry Dataset: Procedures and Patterns.”Journal of Peace Research43 (3): 331–48.
27.
KroenigMatthew. 2009. “Importing the Bomb: Sensitive Nuclear Assistance and Nuclear Proliferation.”Journal of Conflict Resolution53 (2): 161–80.
LewisJeffrey. 2007. The Minimum Means of Reprisal: China’s Search for Security in the Nuclear Age. Cambridge, MA: MIT Press.
30.
LiaoTimothy. 1994. Interpreting Probability Models: Logit, Probit, and Other Generalized Linear Models. Thousand Oaks, CA: Sage.
31.
MearsheimerJohn J.1984. “Nuclear Weapons and Deterrence in Europe.”International Security9 (3): 19–646.
32.
MearsheimerJohn J.1990. “Back to the Future: Instability in Europe after the Cold War.”International Security15(1): 5–56.
33.
MooreRichard. 2001. “Where Her Majesty’s Weapons Were.”Bulletin of the Atomic Scientists57 (1): 58–64.
34.
NarangVipin. 2009. “Posturing for Peace: Pakistan’s Nuclear Postures and South Asian Stability.”International Security34 (3): 38–78.
35.
NarangVipin. 2013. “What Does It Take to Deter? Regional Power Nuclear Postures and International Conflict.”Journal of Conflict Resolution57 (3): 478–508.
36.
NarangVipin. Forthcoming. Nuclear Strategy in the Modern Era: Regional Powers and International Conflict. Princeton, NJ: Princeton University Press.
37.
O’NeillBarry. 1990. “The Intermediate Nuclear Force Missiles: An Analysis of Coupling and Reassurance.”International Interactions15(3/4): 345–63.
38.
PaulT. V.2000. Power versus Prudence: Why Nations Forgo Nuclear Weapons. Montreal, Canada: McGill-Queen’s University Press.
39.
ReiterDan. Forthcoming. “Security Commitments and Nuclear Proliferation.”Foreign Policy Analysis.
40.
SaganScott D. 1996/1997. “Why Do States Build Nuclear Weapons? Three Models in Search of a Bomb.”International Security21 (3): 54–86.
41.
SaganScott D.2000. “The Origins of Military Doctrine and Command and Control Systems.” In Planning the Unthinkable: How New Powers Will Use Nuclear, Biological, and Chemical Weapons, edited by R. LavoyPeterD. SaganScottJ. WirtzJames. Ithaca, NY: Cornell University Press, 16–46.
42.
SasikumarKarthikaWayChristopher. 2009. “Testing Theories of Proliferation in South Asia.” In Inside Nuclear South Asia, edited by SaganScott D., 68–105. Stanford, CA: Stanford University Press.
43.
SauerTomZwaanBob van der. 2011. U.S. Tactical Nuclear Weapons in Europe after NATO’s Lisbon Summit: Why Their Withdrawal Is Desirable and Feasible. Belfer Center Discussion Paper No. 5, Belfer Center for Science and International Affairs, Cambridge, MA.
44.
SchellingThomas C.1960. The Strategy of Conflict. Cambridge, MA: Harvard University Press.
45.
SchellingThomas C.1966. Arms and Influence. New Haven, CT: Yale University Press.
SechserTodd S.SaundersElizabeth N.. 2010. “The Army You Have: The Determinants of Military Mechanization, 1979–2001.”International Studies Quarterly54 (2): 481–511.
50.
SinghSonaliWayChristopher R.. 2004. “The Correlates of Nuclear Proliferation: A Quantitative Test.”Journal of Conflict Resolution48 (6): 859–85.
51.
SolingenEtel. 2007. Nuclear Logics: Contrasting Paths in East Asia and the Middle East. Princeton, NJ: Princeton University Press.
52.
SpectorLeonard S.with Jacqueline R. Smith. 1990. Nuclear Ambitions: The Spread of Nuclear Weapons 1989–1990. Boulder, CO: Westview Press.
53.
WohlstetterAlbert. 1961. “Nuclear Sharing: NATO and the N + 1 Country.”Foreign Affairs39 (3): 355–87.
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