Ukrainian President Volodymyr Zelensky and the first lady Olena Zelenska have arrived in Ireland for their first official visit.
They arrived at Dublin Airport shortly before 11pm last night.
Upon their arrival, Mr Zelensky and his wife were greeted on the runway by Taoiseach Micheál Martin and Minister of State at the Department of Foreign Affairs Thomas Byrne.
The Taoiseah said he was "honoured" to welcome the Ukrainian president and the first lady to Ireland.
"Our support for the people of Ukraine as they defend their freedom and democracy remains unwavering," he said in a post on social media platform X.
Watch: Moment Zelensky arrives at Dublin Airport
Mr Zelensky is due to hold a bilateral meeting with the Taoiseach and pay a courtesy call to President Catherine Connolly before addressing a joint sitting of the Oireachtas while in the capital.
The Ukrainian leader will be met by Mr Martin on the steps of Government Buildings this morning after his courtesy call to President Connolly at Áras an Uachtaráin.
The visit comes at a critical time for the Ukrainian peace plan as US efforts continue to broker a ceasefire in Russia's invasion of Ukraine.
The Ukrainian leader met French president Emmanuel Macron in Paris yesterday as part of discussions on ending the largest armed conflict in Europe since World War II.
Mr Zelensky and Mr Macron joined a call with about a dozen other European leaders, including those of Britain, Germany, Italy, Poland and the European Union.
The Taoiseach and Mr Zelensky are likely to discuss ways in which Ireland can ensure that Ukraine comes to the negotiating table in as strong a position as possible.
To that end the Cabinet will pledge an additional €100 million in non-lethal military support for Ukraine and a contribution of €25m towards the country's urgent energy needs.
Minister for Foreign Affairs Helen McEntee will also ask the Government to approve Ireland's participation in an International Claims Commission for Ukraine.
The commission will be responsible for determining claims for damage, loss or injury caused by Russia against Ukraine.
Mr Zelensky is also due to attend the launch of the Ireland-Ukraine Economic Forum, which the Tánaiste Simon Harris and Ms McEntee will attend.
The first lady Olena Zelenska will meet Minister for Higher Education James Lawless to examine ways to make it easier for Ukrainian students to study in Ireland.
Security checks took place yesterday in both Government Buildings and Leinster House along with the surrounding areas, in advance of the Ukrainian president's visit.
Leinster House is closed to all but essential personnel due to security concerns, with journalists, party officials and staff told to work offsite.
Separately at Government Buildings, a large viewing platform has been built.
Gardaí have warned the public of potential traffic disruption stemming from the visit of the Ukrainian president and the first lady.
There will be coverage of Ukrainian President Volodymyr Zelensky's visit to Ireland throughout the day on the RTÉ News channel and RTÉ News online.
His address to the joint houses of the Oireachtas will be broadcast on RTÉ One television from just before 3pm and on RTÉ Radio One an extended Drivetime programme will begin at 3.45pm.