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

Local TD Accepts Data Centres Are A "Particular Issue" In Ireland
Katie Taylor Tickets Sell Out for Croke Park Final Fight In September
New Digital Wallet Might Be Needed To Access Pornography Online
Two Men Arrested As Gardaí Seize Firearm And Drugs In Blanchardstown
Trial Of Man Accused Of Attempted Murder Of Three Children Will Be Shown CCTV Today
Second Night Of Riots In Belfast
Victim Loses Eye After Attempted Murder In Belfast On Monday
Report Finds Over 95,000 Children Are In Poverty