Commitment to peace and democracy by republicans is needed for a return to power-sharing in Northern Ireland, Prime Minister Tony Blair has said.
Tony Blair and Bertie Ahern are to meet in London
Speaking after meeting Bertie Ahern, he said both governments "wanted to get the peace process moving forward again".
"That depends on a complete and total end to violence in all forms," he said.
Mr Ahern said they were "rock solid" in their determination to implement the Agreement".
"The key issue is that we can get full implementation of the Agreement," he said.
"Hopefully, sooner rather than later we get to a position where all of the aspects we have pointed out that we require to see from the republican movement are delivered so that allows us to build the trust and confidence that has suffered so much over the last six months and allows us to move forward."
Earlier the prime minister said any move from the IRA would have to be bold if unionists were to be convinced it was credible.
Mr Blair said the group must recognise this as a "one off opportunity".
He said if the IRA passed the "credibility threshold", the obligation would pass to unionists to drop their objections to power-sharing.
Mr Blair and Mr Ahern met in Downing Street to review the political and security situation after a meeting of the British Irish Intergovernmental Conference.
Northern Ireland's political institutions have been suspended since October 2002 amid claims of IRA intelligence-gathering at the Northern Ireland Office.