The news of Ireland's ratification of the treaty was welcomed at the annual commemoration for all those affected by the testing and use of atomic bombs, held in Merrion Square, Dublin, at the memorial cherry tree planted by Irish CND in 1980.
Lord Mayor of Dublin Hazel Chu laid flowers at the cherry tree, stating: "As Lord Mayor of Ireland’s capital city, I warmly welcome Irish ratification of the Treaty on the Prohibition of Nuclear Weapons. It is my hope that this brings us one step closer to the day when no city will ever again face the threat of the horrific destruction by nuclear weapons inflicted on Hiroshima 75 years ago." Lord Mayor Chu praised the work of the Disarmament Section of the Department of Foreign Affairs for their efforts in bringing Irish ratification to completion.
In his speech, Irish CND president, Canon Patrick Comerford, also welcomed the news of Irish ratification of the treaty. Japanese Ambassador Mitsuru Kitano evoked the plea of the hibakusha that the burden they have borne for 75 years should never again be inflicted on anyone, and noted Irish ratification of the TPNW as evidence of Ireland's long-term commitment to nuclear disarmament.
Irish traditional musicians contributed several pieces, combining lament with hope.
The importance of a Treaty outlawing nuclear weapons was recognised by the award of the 2017 Nobel Peace Prize to the International Campaign to Abolish Nuclear Weapons (of which Irish CND is a partner organisation), which joined forces with like-minded states, including Ireland, to campaign for the Treaty.
The Prohibition of Nuclear Weapons Act, signed into law by President Higgins in December 2019, transposed the provisions of the TPNW into Irish law in advance of formal ratification.
Ireland's ratification, together with those of Nigeria and Niue, bring the total number of ratifications to date to 43. It is widely expected that the Treaty will enter into force by the end of 2020, when it has been ratified by 50 states.
For the first time, it will be explicitly contrary to international law to "develop, test, produce, manufacture, otherwise acquire, possess or stockpile nuclear weapons or other nuclear explosive devices." The Treaty also contains provisions on providing assistance for victims and on environmental remediation, and explicitly recognises the disproportionate impact of nuclear weapons on women and children.