The Ljubljana-Hague Convention, adopted after two weeks of intensive negotiations, is the first major treaty in the field of international criminal law since the Rome Statute which established the International Criminal Court (ICC).

It has garnered the support of 80 countries, including Ireland, and will provide for greater international co-operation in the investigation and prosecution of genocide, war crimes, crimes against humanity and other international crimes.

Co-operation will include extradition and mutual legal assistance in the collection of evidence and interview of witnesses. The Convention has a particular focus on victims’ rights.

Tánaiste and foreign affairs minister Micheál Martin said: “Ireland is deeply committed to ensuring that those responsible for the most serious international crimes, including war crimes and crimes against humanity, are held accountable.

“By supporting investigations and prosecutions, this Convention further strengthens the fight against impunity for these crimes.”

Justice minister Simon Harris added: “Given the nature of these most serious crimes, suspects, victims, witnesses and evidence often cross borders. It is therefore paramount to ensure effective international legal cooperation at the global level.

“The Ljubljana-Hague Convention is an important step forward in this regard, and Ireland is committed to working with the international community to realise its full potential.”

In a press release, the government said the agreement is “consistent with Ireland’s policy priority of ensuring accountability for the most serious international crimes”.

The Convention will be subject to national ratification procedures.