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States Parties


Timor-Leste deposited its instrument of ratification for the TPNW with the UN Secretary-General on 20 June 2022, the eve of the Treaty's First Meeting of States Parties (1MSP) in Vienna. On 1 August 2022 it also ratified the Comprehensive Nuclear-Test-Ban Treaty (CTBT).

TPNW Status

26 Sep 2018
20 Jun 2022 (Ratification)
18 Sep 2022
Received 17 Mar 2023
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) Observer
1MSP delegation size (% women) 9 (33%)
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 (Acceded 2003)
Ratified the CTBT Yes (Ratified 2022)
Party to the BWC Yes (Acceded 2003)
Party to the CWC Yes (Acceded 2003)
IAEA safeguards and fissile material
Safeguards agreement No (Signed 2009)
TPNW Art 3(2) deadline 18 Mar 2024
Small Quantities Protocol No (Modified signed 2009)
Additional Protocol No (Signed 2009)
Enrichment facilities/reprocessing plants No
HEU stocks No
Plutonium stocks No

Latest developments

Timor-Leste’s Council of Ministers approved a draft resolution in February 2022 to ratify the TPNW,1 which the National Parliament adopted with unanimous support on 25 April 2022.2 Speaking in support of the resolution, Adaljíza Magno, the Minister of Foreign Affairs and Cooperation of Timor-Leste, said: ‘We know the consequence of the Hiroshima and Nagasaki bombings and we don’t want the world to experience the same thing.’3

When Timor-Leste attended the 1MSP as an observer, as the Treaty had not yet entered into force for it, Magno said that Timor-Leste ‘continues to believe in the power of peaceful dialogue and constructive role played by all states to promote a conducive atmosphere for a peaceful denuclearisation of the world’.4

In a closing statement to the Tenth Review Conference of the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) in August 2022, Timor-Leste and 64 other TPNW supporters urged ‘all states committed to attain and maintain a world without nuclear weapons to join the TPNW without delay’.5


  • Timor-Leste should continue to encourage other states to adhere to the TPNW.

  • Timor-Leste should ensure that all the TPNW obligations are implemented domestically, through legal, administrative, and other necessary measures.

  • Timor-Leste should bring into force its Comprehensive Safeguards Agreement and Additional Protocol with the IAEA.

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