Ulster Unionists yesterday unveiled a 10-point charter which makes Sinn Féin participation in any new executive conditional on "acts of completion".
The Ulster Unionist Charter was made public by the party leader, Mr David Trimble, accompanied by three first-time Assembly candidates.
He said he and his party would work and serve in an inclusive, democratic Assembly and would also work towards the end of all paramilitarism.
But he added that UUP members would "hold firmly to the requirement for acts of completion dealing conclusively with decommissioning, terrorist activity and the effective winding up of paramilitary organisations".
The transition to peace and democracy needed to be brought to a conclusion before Sinn Féin could participate in a new Executive, he added.
Mr Trimble said his party supported the new International Monitoring Commission and he further looked forward to "a normal security profile in a peaceful environment, retaining the Home Service Royal Irish Regiment.
"We seek the devolution of policing and justice powers, but will only consent when there is a fully peaceful and democratic society with wholehearted support for the police," he said.
Ulster Unionists remained opposed to any amnesty or "apparent amnesty" for fugitives on the run or 'OTRs', he said.
Mr Trimble added that policing and sentencing powers should keep pace with those in Britain and said his party was committed to the merit principle in employment, human rights and equal citizenship. The party leader also pledged that Ulster Unionists would work for the social and economic betterment of all and to ensure that Northern Ireland remained British, an integral part of the United Kingdom.
He accused the DUP of being prepared to share devolved policing and justice powers with Sinn Féin while "private armies" remained.
"We do not envisage devolution when private armies are in existence.
"We have never said we will work with republicans sharing power over policing when there are private armies in existence," he added.
He accused the DUP of being prepared to do precisely that, alleging that Mr Sammy Wilson had said he would continue on the Policing Board if Sinn Féin's Mr Gerry Kelly were there.
Mr Trimble stressed his commitment to restoring the political institutions.
"Let nobody doubt our determination to achieve transparent decommissioning, to achieve an Assembly that is going to work for everybody here. We are determined to do that," he said.
"We have achieved a significant amount of progress. We can finish the job if we are supported."
Asked by The Irish Times if he would consider Sinn Féin requests for talks after the election in the absence of "transparency" over IRA decommissioning, he replied: "What is the point in them saying that they accept the need for greater transparency and not delivering it? That is not helpful."
Mr Gerry Adams said he did not wish to comment on Mr Trimble's 10-point charter and on comments concerning future power-sharing in any Executive with Sinn Féin.
He was speaking as he led his party's election candidates in Belfast to hand in their nomination papers in the city centre yesterday.
Asked if he was worried that agreements worked out with other parties in advance of the election could be unpicked, Mr Adams said: "What we're looking for is people to endorse and to validate what we have done so that the process of change can continue."
He added: "Whatever happens the process of change will be strengthened if people vote for Sinn Féin.
"We have taken risks, we want people to endorse that, we want them to join with us, we want to see a prosperous, peaceful future for everyone. The way to do that is to vote for Sinn Féin," Mr Adams said.