The Nuclear Non-Proliferation Treaty has 191 signatory states and has been in force since 1970. It has also failed to prevent nine countries from acquiring nuclear weapons and watched two consecutive review conferences collapse without agreement. Into that credibility gap, emerging powers are inserting themselves — reshaping how nonproliferation diplomacy actually functions.
Why the Traditional Framework Is Losing Ground
For decades, nonproliferation was effectively managed by the P5 — the United States, Russia, China, the United Kingdom, and France. That arrangement depended on P5 cohesion. It no longer exists.
The P5 Credibility Problem
Russia suspended New START participation in 2023 and deployed nuclear rhetoric throughout the Ukraine war. The United States and China have no active bilateral arms control framework. France and the UK are modernizing their arsenals. Article VI of the NPT — the disarmament obligation — is functionally a dead letter among the states it most directly binds.
At the 2022 NPT Review Conference, the final document failed to achieve consensus. When the architects of the system cannot agree on basic principles, its authority over everyone else erodes.
The TPNW as a Parallel Framework
The Treaty on the Prohibition of Nuclear Weapons entered into force in January 2021, driven entirely by non-nuclear states over the explicit opposition of all P5 members and NATO. With 70 ratifications as of 2026, it lacks enforcement mechanisms but carries normative weight. It signals that emerging powers are willing to build alternative frameworks when existing ones stall — and that the P5 no longer holds a monopoly on setting disarmament agendas.
The Key Players and What They Bring
Emerging powers influence nonproliferation through different mechanisms — some institutional, some bilateral, some through regional architecture. Three cases illustrate the range.
India: Leverage Through Ambiguity
India never signed the NPT, tested nuclear weapons in 1998, and spent decades outside the global regime. The 2008 U.S.-India Civil Nuclear Agreement changed that. Washington granted India access to civilian nuclear technology and de facto recognition as a responsible nuclear state without requiring NPT accession — giving India disproportionate influence in defining how the international community distinguishes acceptable from unacceptable nuclear programs.
India now participates in the Nuclear Suppliers Group and positions itself as a bridge between nuclear and non-nuclear states. Its leverage comes from operating inside and outside the regime simultaneously.
Brazil and Argentina: A Replicable Model
Both countries ran active nuclear weapons programs through the 1980s. In 1991 they established ABACC — the Brazilian-Argentine Agency for Accounting and Control of Nuclear Materials — a mutual inspection regime that exceeded IAEA standards at the time. Two rival states with weapons capability chose mutual verification over unilateral restraint without external pressure.
Diplomats cite ABACC as a template for other regional rivalries. Brazil has leveraged this credibility in multilateral forums, and Brazilian diplomats have been central figures in NPT review conference negotiations for two decades.
South Africa: The Disarmament Credential
South Africa is the only country to have independently developed nuclear weapons and voluntarily dismantled them — completing the process in 1989 before joining the NPT in 1991. No P5 member can make that claim.
Pretoria has used this position to advocate for TPNW ratification, push disarmament timelines in NPT forums, and run technical assistance programs for African states building civilian nuclear capacity. South Africa’s verified disarmament record is rare and durable diplomatic capital.
Where Emerging Power Influence Is Most Consequential
Emerging powers concentrate their impact in two areas where institutional design gives them structural advantages over P5 states.
IAEA Governance Reform
The IAEA Board of Governors has 35 members. Emerging economies — Brazil, India, South Africa, Mexico, Egypt — have pushed for reforms giving developing states more voice in safeguards policy and violation response protocols.
The Iran and North Korea cases exposed the core problem: IAEA enforcement depends entirely on Security Council referral, meaning P5 veto politics can block action indefinitely. Emerging powers have argued for strengthening the agency’s independent authority — reducing P5 control while increasing institutional effectiveness. The reform agenda is now a permanent feature of IAEA governance debates.
Nuclear-Weapon-Free Zones
Five regional nuclear-weapon-free zones cover most of the Southern Hemisphere: Tlatelolco (Latin America), Rarotonga (South Pacific), Bangkok (Southeast Asia), Pelindaba (Africa), and Semipalatinsk (Central Asia) — all negotiated by non-nuclear emerging states. Together they cover over 100 countries and represent the most consistently enforced segment of the global nonproliferation architecture.
Extending this model to the Middle East — where a nuclear-weapon-free zone has been proposed since 1995 — is where emerging powers carry more credibility than P5 states with competing strategic interests in the region.
The Ceiling: Where Influence Ends
Diplomatic credibility is not enforcement capacity. Emerging powers can shape norms, build regional frameworks, and pressure P5 states in multilateral settings. They cannot sanction states that violate safeguards, intercept illicit nuclear transfers, or compel compliance from governments that calculate weapons are worth the political cost.
North Korea is the limiting case. Every nonproliferation forum has condemned its weapons program. None has reversed it. Until emerging powers develop enforcement tools or sufficient coalition leverage to shift proliferating states’ incentives, their role will remain more influential than decisive.
What has changed is the baseline. Nonproliferation is no longer a P5-managed system with peripheral participation by everyone else. It is a contested multilateral space where emerging powers set agendas, build alternative frameworks, and define legitimacy — even when they cannot yet enforce outcomes.