Sinn Féin president Gerry Adams has called on the British government to lift the suspension of the power-sharing administration at Stormont and deliver its pledges on the Belfast Agreement.
Mr Adams, speaking ahead of a meeting with Northern Ireland secretary Paul Murphy at Hillsborough Castle, Co Down, said the emergence of the anti-agreement DUP as the largest unionist party must not prevent the government from moving ahead.
He said: "We want to see the suspension of the institutions lifted and all of the other institutions that are part of the joint declaration that we negotiated, the unfinished business of the Good Friday Agreement, we want acts of completion on all of those."
Among his demands were further moves on demilitarisation, for the return of so-called "on the run" terrorist suspects, and for progress on criminal justice issues.
The Northern Ireland secretary has conceded that negotiations will be more difficult after the DUP's elevation to largest-party status but has said the fundamental principles of the Agreement are not up for renegotiation.
The DUP, which is calling for a new agreement, has said it will not hold face-to-face talks with Sinn Fein, but Mr Adams said the party had changed its position on other issues and was now taking part in television debates with his party.
"They are the people who say they want to renegotiate. Who are they going to renegotiate with if not with us? We are the lead pro-agreement party."
The Sinn Féin president insisted that the DUP would now have a veto on progress, adding that if deputy leader Peter Robinson wanted a ministerial role the price he would have to pay was the Belfast Agreement.
"The reality is that this is a process. All the people who are against progress can do is delay it. They cannot prevent it," he added.
PA