Taoiseach Leo Varadkar has met the British Prime Minister Boris Johnson in Belfast as power sharing resumes at Stormont.
The Stormont executive was restored at the weekend following its collapse in 2017.
The DUP's Arlene Foster was reappointed as First Minister during an Assembly meeting on Saturday, while Sinn Féin's Michelle O'Neill was named as Deputy First Minister
They also met the Taoiseach today along with Mr Johnson, Tánaiste Simon Coveney and Secretary of State for Northern Ireland Julian Smith.
Catching up with @simoncoveney @DUPleader and @moneillsf on this significant day in Stormont to mark the return of power sharing pic.twitter.com/TQM4SO2t4Z
— Leo Varadkar (@LeoVaradkar) January 13, 2020
Speaking this afternoon, Mr Varadkar and Mr Johnson said now that the Stormont government is up and running again, it needs to get to work.
The Taoiseach said: "To me, the Good Friday Agreement is visionary and the Good Friday Agreement is working again.
"Power sharing here in Northern Ireland, north-south co-operation, is going to resume.
He said: "We're going to be deep in co-operation between Britain and Ireland in the interests of everyone who lives on these islands."
Mr Johnson said that it was a "fine thing" that leaders in Northern Ireland had put aside their differences and "stepped up to the plate".
The leaders will be able to develop "a very promising set of circumstances" for the region and its people, he said.