NATO Non-Nuclear Weapon State
Sharing US Nuclear Weapons
Estimate Arsenal Size
- 10-20 U.S. non-strategic gravity B-61 warheads at the Büchel Air Base 
- Reliable documents indicate that an estimated 130 U.S. nuclear weapons at the Ramstein Air Base were removed between 2001 and 2005. 
- Non-strategic warheads: B-61-3, B-61-4 
- Delivery Aircraft: German PA-200 Tornados
- The U.S. National Nuclear Security Administration (NNSA) is currently modernizing the non-strategic warheads deployed in Europe. NNSA is refurbishing and replacing components of the aging B-61-3 and B-61-4 warheads, converting them into the updated B61-12 model. Under NNSA’s B61-12 Life Extension Plan, the updated warheads will enter full production in 2020 and be deployed by 2024. 
- B-61-3: maximum yield of 170 kilotons
- B-61-4: 45 kilotons 
Nuclear Weapons Policies
- In the 2018 Brussels Summit, NATO reaffirmed that the fundamental purpose of NATO’s nuclear forces is deterrence, and that as long as nuclear weapons exist, NATO will remain a nuclear alliance. 
- Germany is a member of the Non-Proliferation and Disarmament Initiative (NPDI), a group of non-nuclear weapon states dedicated to disarmament, nonproliferation and peaceful nuclear activities as outlined in the NPT and the 2010 NPT Review Conference. 
- Germany, as a NATO country that hosts U.S. nuclear weapons, does not support the Treaty on the Prohibition of Nuclear Weapons (TPNW). It believes U.S. nuclear weapons are vital to Germany’s security. 
- State party to the NPT and PTBT. Signed and ratified the CTBT. 
 Hans M. Kristensen, "Non-Strategic Nuclear Weapons, Special Report No 3," Federation of American Scientists, May 2012, www.fas.org.Hans M. Kristensen, "Status of U.S. Nuclear Weapons in Europe 2010," Federation of American Scientists, 12 February 2010, www.fas.org
 "Nonstrategic Nuclear Weapons," Report by Specialist in Nuclear Weapons Policy Amy F. Woolf, Congressional Research Service, 23 February 2015, www.fas.org.
 Hans M. Kristensen, "Non-Strategic Nuclear Weapons, Special Report No 3," Federation of American Scientists, May 2012, www.fas.org, Robert S. Norris and Hans M. Kristensen, "Worldwide Deployments of Nuclear Weapons 2009," Nuclear Notebook, Natural Resources Defense Council, Bulletin of the Atomic Scientists, November/December 2009, pp 86-98. https://thebulletin.metapress.com.
 United States Government Accountability Office, NNSA Has a New Approach to Managing the B-61-12 Life Extension, but a Constrained Schedule and Other Risks Remain, GAO-16-218, February 2016, pp. 10-25, www.gao.gov.
 Hans M. Kristensen, "U.S. Nuclear Weapons in Europe," Natural Resources Defense Council, February 2005, p. 9, www.nrdc.org.
 "NATO Summit Guide, Brussels 2018," NATO, 11 July 2018, www.nato.int.
 "NPDI Statement for 2015 NPT Review Conference," Statement by the Minister of Foreign Affairs of the Netherlands, 2015 Review Conference of the Parties to the Treaty on the Non-Proliferation of Nuclear Weapons, 27 April 2015, www.un.org.
 "Positions on the treaty" International Campaign to Abolish Nuclear Weapons, 7 July 2017, www.icanw.org.
 Inventory of International Nonproliferation Organizations & Regimes, www.nonproliferation.org; Reaching Critical Will, accessed 29 June 2015, www.reachingcriticalwill.org.
Explore the Collection
Sign up for our newsletter to get the latest on nuclear and biological threats.
Overview of the Nuclear Disarmament Resource Collection
View information and analysis of nuclear weapons disarmament proposals and progress worldwide, including detailed coverage of disarmament progress.
U.S. Nuclear Policies for a Safer World
NTI Co-Chairs Ernest J. Moniz and Sam Nunn call on the United States to resume a position of global leadership to reduce the risks posed by nuclear weapons.
Connecting the Pillars of the NPT: Multilateral Disarmament Verification and Non-Proliferation
To support full implementation of the NPT, it is crucial to find a way for non-nuclear weapon states to fulfill their obligation to contribute to disarmament without accessing nuclear weapons or knowledge of their designs, specific materials, or applied technologies.
- Non-nuclear weapon state (NNWS)
- Non-nuclear weapon state (NNWS): Under the Treaty on the Non-Proliferation of Nuclear Weapons (NPT), NNWS are states that had not detonated a nuclear device prior to 1 January 1967, and who agree in joining the NPT to refrain from pursuing nuclear weapons (that is, all state parties to the NPT other than the United States, the Soviet Union/Russia, the United Kingdom, France, and China).
- Kiloton: A term used to quantify the energy of a nuclear explosion that is equivalent to the explosion of 1,000 tons of trinitrotoluene (TNT) conventional explosive.
- Nonproliferation and Disarmament Initiative (NPDI)
- Nonproliferation and Disarmament Initiative (NPDI): Founded by Australia, Canada, Chile, Germany, Japan, Mexico, the Netherlands, Poland, Turkey, and the United Arab Emirates in September 2010, the Nonproliferation and Disarmament Initiative (NPDI) is a ministerial-level group of states within the framework of the Nonproliferation Treaty focused on practical steps that will forward the consensus outcomes of the 2010 NPT Review Conference.
- Nonproliferation: Measures to prevent the spread of biological, chemical, and/or nuclear weapons and their delivery systems. See entry for Proliferation.
- Treaty on the Non-Proliferation of Nuclear Weapons (NPT)
- The NPT: Signed in 1968, the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) is the most widely adhered-to international security agreement. The “three pillars” of the NPT are nuclear disarmament, nonproliferation, and peaceful uses of nuclear energy. Article VI of the NPT commits states possessing nuclear weapons to negotiate in good faith toward halting the arms race and the complete elimination of nuclear weapons. The Treaty stipulates that non-nuclear-weapon states will not seek to acquire nuclear weapons, and will accept International Atomic Energy Agency safeguards on their nuclear activities, while nuclear weapon states commit not to transfer nuclear weapons to other states. All states have a right to the peaceful use of nuclear energy, and should assist one another in its development. The NPT provides for conferences of member states to review treaty implementation at five-year intervals. Initially of a 25-year duration, the NPT was extended indefinitely in 1995. For additional information, see the NPT.
- Partial Test Ban Treaty (PTBT)
- The PTBT: Also known as the Limited Test Ban Treaty (LTBT), the Treaty Banning Nuclear Weapons Tests in the Atmosphere, in Outer Space and Under Water prohibits nuclear weapons tests "or any other nuclear explosion" in the atmosphere, in outer space, and under water. While the treaty does not ban tests underground, it does prohibit nuclear explosions in this environment if they cause "radioactive debris to be present outside the territorial limits of the State under whose jurisdiction or control" the explosions were conducted. The treaty is of unlimited duration. For additional information, see the PTBT.
- Ratification: The implementation of the formal process established by a country to legally bind its government to a treaty, such as approval by a parliament. In the United States, treaty ratification requires approval by the president after he or she has received the advice and consent of two-thirds of the Senate. Following ratification, a country submits the requisite legal instrument to the treaty’s depository governments Procedures to ratify a treaty follow its signature.
See entries for Entry into force and Signature.
- Comprehensive Nuclear-Test-Ban Treaty (CTBT)
- The CTBT: Opened for signature in 1996 at the UN General Assembly, the CTBT prohibits all nuclear testing if it enters into force. The treaty establishes the Comprehensive Test Ban Treaty Organization (CTBTO) to ensure the implementation of its provisions and verify compliance through a global monitoring system upon entry into force. Pending the treaty’s entry into force, the Preparatory Commission of the CTBTO is charged with establishing the International Monitoring System (IMS) and promoting treaty ratifications. CTBT entry into force is contingent on ratification by 44 Annex II states. For additional information, see the CTBT.