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Costa Rica Costa Rica

Costa Rica

States with nuclear-free security strategies

Costa Rica was at the forefront of the diplomatic process towards a treaty prohibiting nuclear weapons, and Costa Rica’s Permanent Representative to the United Nations in Geneva, Ambassador Elayne Whyte Gómez, chaired the negotiations in 2017 that resulted in the adoption of the TPNW. Costa Rica has signed and ratified the TPNW and is in compliance with all of the prohibitions in Article 1 of the Treaty.

Latest developments and background

On 26 September 2019 Costa Rica’s President, Carlos Alvarado Quesada, made the following statement about the TPNW in the UN: "We have embarked on a path in seeking prohibition and elimination of these terrible weapons. We must fill the existing legal vacuum and add a chapter to international law that should have been written many years ago." He also encouraged states who have not yet done so to sign and speed up the ratification process, and added: "The treaty bolsters the political standard-setting, humanitarian and legal imperatives of nuclear disarmament which are the prime objective of this organization." (


  • Costa Rica should continue to encourage other states to adhere to the TPNW.
  • Costa Rica should ensure that all the TPNW obligations are implemented into national law.
Yes (20 Sep 2017)
Ratified (5 Jul 2018)
Compliance with article 1(1) of the TPNW
Art 1(1)(a) The prohibition on developing, producing, manufacturing, or otherwise acquiring Compliant
The prohibition on testing Compliant
The prohibition on possessing or stockpiling Compliant
Art 1(1)(b) The prohibition on transferring Compliant
Art 1(1)(c) The prohibition on receiving transfer or control Compliant
Art 1(1)(d) The prohibition on using Compliant
The prohibition on threatening to use Compliant
Art 1(1)(e) The prohibition on assisting prohibited activities Compliant
The prohibition on encouraging or inducing prohibited activities Compliant
Art 1(1)(f) The prohibition on encouraging or inducing prohibited activities Compliant
Art 1(1)(g) The prohibition on allowing stationing, installation, or deployment Compliant
TPNW process
Vote on mandate resolution (A/RES/71/258) Voted yes
Participated in treaty negotiations (% women) Yes (75%)
Vote on adoption of treaty text Voted yes
Vote on UNGA resolution 2018 Voted yes
Fissile material
Highly enriched uranium stocks No
Civilian plutonium stocks
Fissile material production No
Related treaties and mechanisms
Party to the NPT Yes
Party to a NWFZ Yes (Tlatelolco)
Ratified the CTBT Yes
Party to the PTBT Yes
Member of the CD No (Observer)
IAEA CSA in force Yes
IAEA AP in force Yes
Party to the CWC Yes
Party to the BWC Yes