The Irish and British governments have insisted today's events in Stormont would not disrupt efforts to secure devolved government for Northern Ireland.
Taoiseach Bertie Ahern said Stone's actions would strengthen the Irish and British governments' resolve to secure a deal in the North.
"It seems that Michael Stone has gone on the rampage again, in a very dangerous way. But he was stopped," Mr Ahern told reporters in Dublin. "It just shows you exactly what we are trying to get away from in Northern Ireland."
Mr Ahern was visibly angry as he spoke to reporters during a visit to St Andrew's Resource Centre in central Dublin. "Michael Stone is well-known to us from previous incidents. This is all a good example why an Assembly would be a good idea."
British Prime Minister Tony Blair insisted the St Andrews Agreement remains the "only way forward" in the wake of turbulent events at Stormont today.
Speaking in Downing Street, Mr Blair said he had watched the events unfold on television. "There's obviously been an attempt by a paramilitary to try and disrupt the events at Stormont today," he said. "Instead of that putting us off progress towards democracy, it's precisely what should make us more resolute in confining that kind of activity to the past, and making sure that democratically elected politicians are able to exercise their democratically given power without paramilitaries of any sort interfering with it."
He said he had spoken to both DUP leader the Rev Ian Paisley and Sinn Fein leader Gerry Adams, and was determined that "paramilitaries" would not be allowed to disrupt democracy.
"No move forward in Northern Ireland is easy, we've learned that over 10 years, and it's not because the people, or indeed, the leaders in Northern Ireland want it to be so, but because each step towards a different and better future is taken alongside the memory of a wretched and divisive past."