Micheál Martin became the first Irish premier to attend a police passing-out ceremony in Northern Ireland on Friday.
He was present at an attestation service for 36 new officers at the Police Service of Northern Ireland's training college near Garnerville.
The event took place alongside Northern Ireland Secretary Sir Chris Bryant and PSNI Chief Constable Jon Boutcher.
These recruits entered the academy in June after completing a twenty-two-week course designed to build community trust and increase Catholic representation among ranks.
The ceremony concluded a week celebrating the twenty-fifth anniversary of the PSNI, which succeeded the Royal Ulster Constabulary following peace process reforms in 2001.
Garda commissioner Justin Kelly previously attended a similar event at the invitation of Chief Constable Boutcher in August this year.
Micheál Martin's attendance highlighted the ongoing partnership between An Garda Síochána and the PSNI, which includes joint efforts against planned attacks by dissident republican groups such as the New IRA.
The officers successfully completed their training before taking the oath to serve the public.
This marks a significant moment for inter-departmental cooperation in policing across the border.
No further details on future implications were provided at the time of reporting.