British Prime Minister Tony Blair is to meet Sinn Féin president Gerry Adams in Chequers later this week as pressure mounts on republicans over the Northern Bank heist.
Next week, Mr Blair will meet the Taoiseach who is holding what is expected to be a tense a meeting with a Sinn Féin delegation in Dublin tomorrow. The Taoiseach has said he believes the IRA was involved in the £26.5 million heist.
But Sinn Féin is expected to concentrate on the Taoiseach's further claim that the Sinn Féin leadership had prior knowledge of the heist.
Mr Blair is expected to warn Mr Adams that the Provisionals must cease all paramilitary and criminal activity, if republicans are to be included in devolution.
Mr Blair is holding the talks at his country residence because of the possible political sensitivity of a meeting in No 10 Downing Street. Mr Blair is also to meet the Taoiseach on Tuesday, February 1st.
Two days later Mr Blair will meet Ulster Unionist Party leader Mr David Trimble.
Mr Blair's spokesman said: "The message is very simple. It is that there can be no deal with republicans unless all activity, paramilitary and criminal, stops. Period. That's it.
"In terms of the way forward with the Taisoeach, he is going to have his own meeting with Sinn Féin. The two prime ministers will compare notes and also talk about the positions of the other parties as well."
Mr Ahern is meeting Mr Adams tomorrow in Dublin. He will also separately meet the SDLP and the UUP.
Ahead of the meeting, the Tánaiste, Ms Harney, insisted Sinn Féin must make it clear that the Provisional IRA has ended all forms of criminality, violence and paramilitarism before the political process in the North can move forward.