Model UN Background Guide

Committee: Disarmament and International Security Committee (DISEC, GA1)

Topic: Nuclear Modernization and Arms Control

Conference Year: 2025

Topic Background

Nuclear weapons have defined international security since their inception in 1945, shaping the Cold War and continuing to influence geopolitical dynamics today. The concept of nuclear modernization refers to efforts by nuclear-armed states to upgrade or replace their existing arsenals with newer, more sophisticated weapons systems, delivery platforms, and command-and-control technologies. Modernization programs often include developing hypersonic delivery vehicles, improved warheads, and enhanced missile defense systems. While these efforts are framed by some states as necessary for deterrence and maintaining credible defense postures, they have raised concerns about a renewed arms race, strategic instability, and the undermining of global arms control regimes.

The topic is on the agenda in 2025 due to several converging factors:

• Renewed great power competition, especially between the United States, Russia, and China, has led to increased investments in nuclear capabilities.
• The erosion of key arms control agreements, such as the demise of the INF Treaty (2019), the uncertain future of New START (renewed but with limited scope), and stalled negotiations on new frameworks, have created a regulatory vacuum.
• Emerging technologies, including cyber capabilities and artificial intelligence, are increasingly integrated into nuclear command and control, raising risks of miscalculation or accidental escalation.
• Growing advocacy by non-nuclear-weapon states and civil society for disarmament, culminating in the adoption of the Treaty on the Prohibition of Nuclear Weapons (TPNW) in 2017, although major nuclear powers have not joined.
• Heightened tensions in regions such as South Asia and the Korean Peninsula, where nuclear doctrines and modernization efforts are evolving rapidly.

This agenda item challenges delegates to balance the realities of deterrence and national security with the imperative of arms control and non-proliferation, aiming to prevent nuclear conflict and promote strategic stability.

Key Actors

Nuclear-Weapon States (NWS):

• United States: Leading nuclear arsenal modernization programs across all triad components (land-based ICBMs, submarine-launched ballistic missiles, and strategic bombers). Emphasizes deterrence but supports arms control dialogue, conditional on reciprocity.
• Russia: Also modernizing its nuclear forces, including new missile systems and hypersonic weapons. Views nuclear weapons as central to its strategic deterrence and global influence.
• China: Expanding and modernizing its relatively smaller nuclear arsenal with new missile silos and delivery systems. Traditionally favored minimal deterrence but is increasing its capabilities, raising regional and global concerns.
• France and the United Kingdom: Maintaining modernization programs, though with smaller arsenals; emphasize strategic stability and arms control.

Non-Nuclear-Weapon States (NNWS):

• Countries advocating for disarmament and adherence to the TPNW, such as Austria, Ireland, South Africa, and many members of the Non-Aligned Movement (NAM), push for stronger legal prohibitions on nuclear weapons and criticize modernization as destabilizing.
• South Asian states (India and Pakistan): Both nuclear-armed and engaged in ongoing modernization, with regional rivalry fueling arms development. Neither is a party to the NPT but they maintain nuclear doctrines emphasizing deterrence.

International Organizations:

• United Nations Office for Disarmament Affairs (UNODA): Facilitates dialogue, transparency, and implementation of disarmament treaties.
• International Atomic Energy Agency (IAEA): Primarily focused on non-proliferation and safeguards but indirectly linked to arms control through verification mechanisms.
• Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO): Works to monitor and enforce the CTBT, which constrains nuclear testing, a key part of modernization.
• Conference on Disarmament (CD): The primary multilateral forum for disarmament negotiations, though currently stalled on nuclear issues.

Bloc Positions

1. Nuclear-Armed States and Allies:

• Emphasize maintaining credible deterrence through modernization programs.
• Support arms control but insist on verifiable and balanced agreements.
• Skeptical of TPNW, viewing it as unrealistic without universal participation.
• Examples: United States, Russia, China, France, United Kingdom, NATO members.

2. Non-Aligned and Disarmament Advocates:

• Advocate for immediate cessation of nuclear modernization.
• Support the TPNW and call for universal nuclear disarmament.
• Criticize modernization as provocative and destabilizing.
• Examples: Non-Aligned Movement members, Austria, Ireland, South Africa, Latin American countries (e.g., Brazil, Mexico).

3. Regional Nuclear Powers Outside NPT:

• Focus on regional security concerns driving modernization.
• Maintain nuclear arsenals as deterrence against perceived threats.
• Oppose external pressure to disarm without addressing regional rivalries.
• Examples: India, Pakistan, North Korea.

4. Emerging Powers and Middle Powers:

• Often emphasize multilateralism and strengthening existing frameworks.
• Support confidence-building measures and transparency to reduce risks.
• May be cautious in criticizing nuclear powers directly, seeking pragmatic solutions.
• Examples: Japan, Australia, South Korea, Brazil.

Past UN Action

• UNGA Resolution 70/57 (2015): Calls for the commencement of negotiations on a legally binding instrument to prohibit nuclear weapons, leading to the TPNW.
• UNGA Resolution 71/258 (2016): Established the Open-Ended Working Group on nuclear disarmament, which contributed to the TPNW negotiations.
• UNGA Resolution 75/36 (2020): Calls for the extension of New START and urges states to refrain from nuclear arms races.
• UNSC Resolution 1887 (2009): Affirms the goal of nuclear disarmament and non-proliferation, emphasizing the importance of arms control agreements.
• Various reports by the UN Secretary-General on nuclear disarmament and non-proliferation, highlighting risks associated with modernization and urging renewed diplomatic efforts.

Questions a Resolution Should Answer

1. How can the international community effectively address the challenges posed by ongoing nuclear modernization programs while respecting national security concerns?
2. What mechanisms can be strengthened or introduced to enhance transparency and confidence-building among nuclear-armed states?
3. How should the UN support or integrate emerging technologies (e.g., cyber, AI) into arms control verification and risk reduction?
4. What role can the UN play in bridging the divide between nuclear-armed states and non-nuclear-weapon states, particularly regarding the TPNW and NPT frameworks?
5. How can regional security concerns be addressed to reduce incentives for nuclear modernization, especially in South Asia and Northeast Asia?
6. What measures can be taken to revive or replace stalled arms control agreements to prevent a new arms race?
7. How can the UN promote universal adherence to existing treaties such as the CTBT and New START, and encourage new commitments?

Further Reading

• UN Documents: Official General Assembly and Security Council resolutions on nuclear disarmament, reports from the Secretary-General on disarmament and non-proliferation, and documentation from UNODA and the Conference on Disarmament provide authoritative insights and the international legal framework.

• Think-Tank Reports: Analysis and policy papers from institutions such as the Stockholm International Peace Research Institute (SIPRI), the Nuclear Threat Initiative (NTI), and the Arms Control Association offer detailed assessments of modernization programs, technological trends, and arms control prospects.

• News Outlets and Expert Commentary: Reputable international news organizations like Reuters, BBC, and Al Jazeera regularly cover developments in nuclear policy, treaty negotiations, and geopolitical tensions. Expert commentary from security analysts and former diplomats can provide context on evolving nuclear doctrines and diplomatic challenges.

This background guide aims to equip delegates with a nuanced understanding of the complex and urgent issue of nuclear modernization and arms control, fostering informed debate and constructive resolution drafting in DISEC 2025.