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States Parties

Sri Lanka

Sri Lanka acceded to the TPNW in September 2023, after having ratified the Comprehensive Nuclear-Test Ban Treaty (CTBT) earlier in the year.

TPNW Status

19 Sep 2023 (Accession)
18 Dec 2023
Received 18 Jan 2024
TPNW Article 1(1) prohibitions: Compliance in 2022
(a) Develop, produce, manufacture, acquire Compliant
Test Compliant
Possess or stockpile Compliant
(b) Transfer Compliant
(c) Receive transfer or control Compliant
(d) Use Compliant
Threaten to use Compliant
(e) Assist, encourage or induce Compliant
(f) Seek or receive assistance Compliant
(g) Allow stationing, installation, deployment Compliant
TPNW voting and participation
UNGA resolution on TPNW (latest vote) Voted yes (2023)
Participated in 1MSP (2022) No
1MSP delegation size (% women) N/A
Adoption of TPNW (7 July 2017) Voted yes
Participated in TPNW negotiations (2017) Yes
Negotiation mandate (A/RES/71/258) Voted yes
Other weapons of mass destruction (WMD) treaties
Party to an NWFZ No
Party to the NPT Yes (Ratified 1979)
Ratified the CTBT Yes (Ratified 2023)
Party to the BWC Yes (Ratified 1976)
Party to the CWC Yes (Ratified 1994)
IAEA safeguards and fissile material
Safeguards agreement Yes (6 Aug 1984)
TPNW Art 3(2) deadline N/A
Small Quantities Protocol No
Additional Protocol No (Approved 2018)
Enrichment facilities/reprocessing plants No
HEU stocks No
Plutonium stocks No

Latest developments

Sri Lanka voted in favour of adopting the TPNW at the UN Diplomatic Conference in 2017 and has consistently voted in favour of the annual UN General Assembly resolutions on the Treaty, including in 2022.

Sri Lanka maintains policies and practices that are compatible with all of the prohibitions in Article 1 of the TPNW, and can therefore sign and ratify or accede to the Treaty without the need for a change in conduct.

At the Tenth Review Conference of the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) in August 2022, Sri Lanka said that the threat of nuclear weapons ‘is one of the most significant and pressing global challenges of our time’, and lamented the fact that nearly 13,000 such weapons exist in the world today, which it described as ‘the most destructive, inhumane, and indiscriminate weapons ever used’.1

In the First Committee of the UN General Assembly in October 2022, Sri Lanka said: ‘Pursuing non-proliferation while ignoring nuclear disarmament creates two clubs of “nuclear haves” and “nuclear have-nots” and therefore is not sustainable.’2


  • Sri Lanka should encourage other states to adhere to the TPNW:

  • Sri Lanka should bring into force its Additional Protocol with the IAEA.

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