Taoiseach Micheál Martin is due to visit Kyiv tomorrow.
His visit follows an invitation issued by Ukrainian President Volodymyr Zelensky during a telephone conversation between the two around a fortnight ago.
During the conversation, Mr Zelensky thanked Mr Martin for Ireland's support for Ukraine's bid for EU membership.
Mr Martin has travelled to the region today.
He will become the latest in a line of western leaders to have visited the Ukrainian capital and its surrounding region in recent months to meet its president and view the impact of the war.
Foreign leaders have used the opportunity to express solidarity and pledge support for the war-torn country.
Mr Martin's visit to Kyiv is the first official visit of an Irish Taoiseach to Ukraine.
RTÉ News understands that the Taoiseach will express the Irish people's solidarity with citizens of the war-torn country. He will also discuss with Ukrainian authorities how the Ireland can give support.
Like other western leaders who have visited the region, Mr Martin is likely to visit sites devastated in the war. He is likely to reiterate Ireland’s support for Ukraine’s bid for EU membership.
In April, Minister for Foreign Affairs Simon Coveney visited the town of Bucha in Ukraine, where Russian forces' suspected killing of civilians has been broadly condemned.
The minister was taken on a tour of the town near Kyiv, including the site of a mass grave.
At the time, Mr Coveney said the area had been "devastated" and its population "ravaged".
Also in April, Mr Zelensky delivered a historic address to a joint sitting of the Oireachtas, where he thanked Ireland for supporting his country.
He said Ireland has not remained neutral over the disaster Russia has inflicted on his country.
"From the very first days, you are supporting Ukraine and this is a fact," Mr Zelensky said.
"You did not doubt starting helping us, you began doing this right away and although you are a neutral country, you have not remained neutral to the disaster and to the mishaps that Russia has brought to Ukraine."