Ireland and other EU member states will have to financially back Ukraine in the event of the United States withdrawing financial and military support, the Tánaiste and Minister for Foreign Affairs has said.
Simon Harris said Europe is "going to need to provide more financial assistance to Ukraine and Ireland will need to be part of it".
"There will be an opportunity at a special European Council meeting later this week for a clarity to be brought in terms of what that potential quantum for Europe may look like," he added.
The Tánaiste described yesterday's exchange at the White House, between US President Donald Trump and Ukrainian Volodymyr President Zelensky, as "deeply unsettling".
"There's no doubt about that," he added.
His comments come after the row during a meeting in which the Mr Zelensky and Mr Trump were due to sign a deal on sharing Ukraine's mineral riches and discuss a peace deal with Russia.
Mr Harris said from exchanges he has had with other EU Foreign Ministers since then, he has "very much detected over the past 24 hours that European solidarity for Ukraine is even stronger than before".
The Tánaiste said: "Europe has absolute clarity of thought - that we stand with Ukraine, that we support Ukraine and indeed that there can be nothing about Ukraine without Ukraine."
He said there is so much revisionism and misinformation about what he termed Russia's "brutal and illegal invasion".
The Tánaiste said everybody "wants to see peace".
"What we need to do as Europeans - in continuing to engage with each other, with Ukraine and with the United States - is to begin to expand what peace looks like," he said.
"We need to move beyond the rhetoric," he added.
Sinn Féin's Eoin Ó Broin described the exchange between Mr Trump and Mr Zelensky as "remarkable".
Speaking on RTÉ's Saturday with Colm Ó Mongain programme, Mr Ó Broin said such an exchange is a "feature of how Donald Trump is doing his business", adding it is "not a surprise" given the US president's comments about Ukraine.
Regarding the Taoiseach's visit to Washington, Mr Ó Broin said the message to Mr Trump must be "very clear both publicly and privately" that every effort "has to be made and every pressure put, both on Russia and on Israel, for ceasefires".
Meanwhile Taoiseach Micheál Martin is due to meet the UK Prime Minister Keir Starmer next week before attending a special EU leaders summit on Ukraine.
Mr Martin will attend the EU Council meeting on 6 March.
Ahead of the summit, he will travel to London for a private dinner with Mr Starmer and attend other engagements.
The Taoiseach is not attending the so-called "defence summit on Ukraine", which Mr Starmer is hosting tomorrow.
Mr Zelensky is due to attend the defence summit.
Speaking last night on RTÉ's Late Late Show, Mr Martin also denounced the exchange between the US president and his Ukrainian counterpart.
He described it as "quite extraordinary" and "very, very unsettling".
