He was invited by President Zelensky during a phone call two weeks ago.
Taoiseach Micheál Martin is travelling to eastern Europe ahead of an expected visit to war-torn Ukraine this week, Kfm understands.
The Taoiseach has been travelling to eastern Europe today on the invite of President Volodomyr Zelenskyy.
He is expected to visit Ukraine tomorrow after he was invited by President Zelensky during a phone call two weeks ago ahead of last month's European Council meeting
Mr Martin’s trip comes as he was absent from the Dáil today with Tánaiste Leo Varadkar standing in for the Taoiseach at Leaders’ Questions.
Details of the trip have been kept quiet for security reasons.
It's expected the Taoiseach will visit Kiev and meet the Ukrainian President tomorrow.
A number of Fianna Fail politicians have already visited Ukraine including Senator Timmy Dooley and MEP Billy Kelleher

Daniel Kinahan Set To Apply For Bail
Former Swimming Coach George Gibney Jailed For Over 15 Years For Sexual Abuse Of Children
Robert Pether Returning To Ireland After Five-Year Iraqi Detention
Over 23,000 Teachers Beginning Industrial Action Today
New Funding Announced For Youth Services And Counselling In Kildare On World Mental Health Day
Jury In Triple Murder Trial Of Louth Family Sent Home
Appointment Cancellations Expected As Strikes To Take Place Next Week
Families Face Delays Arranging Funerals Amid Pressure On Post-Mortem Services