Leadership teams from Sinn Féin, the SNP and Plaid Cymru convened in Cardiff on Monday to discuss regional priorities.
Michelle O'Neill, Mary Lou McDonald, John Swinney and Rhun ap Iorwerth attended the gathering in their official capacity as party heads rather than government ministers.
The Taoiseach has cautioned that such cooperation with United Kingdom political organisations risks fracturing unity across the island of Ireland.
This discussion follows a separate encounter between Sinn Féin's Mary Lou McDonald and Michelle O'Neill alongside John Swinney and Rhun ap Iorwerth in the Welsh capital.
The meeting took place on Monday morning under the banner of cross-party dialogue.
No formal agreements were announced during the session, though the leaders exchanged views on shared challenges facing their respective constituencies.
Reports suggest the Taoiseach's comments reflect concerns over the trajectory of political alliances in the region.
The group represented distinct political traditions from Derry, London and Cardiff at this juncture.
Further details regarding specific policy outcomes remain to be confirmed by official channels.
The event concluded without a public statement outlining immediate next steps for any of the participating parties.