Sinn Féin shares power with the Democratic Unionists in Northern Ireland's government. Michelle O’Neill serves as first minister. The party met with Scotland’s first minister John Swinney at government summits. They appeared together at the Vatican last year.

Opinion polls point to nationalist parties taking control in Scotland, Wales, and Northern Ireland after elections on 7 May. The Scottish National Party leads in Scotland. Plaid Cymru leads in Wales. Sinn Féin already governs in Belfast alongside the DUP.

Angus Robertson, a Scottish government minister, stated that three nationalist first ministers across the UK nations would require major changes in relations between the UK government and devolved administrations.

Sinn Féin plans to use potential nationalist victories to push for an Irish reunification poll by 2030. The party will make this a focus in its Northern Ireland election campaign in 2027.

The power-sharing arrangement in Northern Ireland remains fractious. Public confidence in Stormont and public services has declined.

Nationalist leaders from the three regions discuss cooperation on spending, taxation, and welfare.