EU leaders are meeting in Brussels this evening following US President Donald Trump's dramatic U-turn on Greenland and tariffs.
The summit, which is being attended by Taoiseach Micheál Martin, was hastily organised at the height of the row over the Arctic island earlier this week.
Despite the threat of tariffs being taken off the table, EU leaders are expected to assess the future relationship with the US which sources in Brussels said was "strong but more complex than before".
Sources said EU leaders would aim to reach a "common understanding" about how to be able to react to future transatlantic problems.
Speaking as he arrived in for the summit, Taoiseach Micheál Martin said any undermining of the "economic interdependence" between Europe and the US "would have very serious repercussions" for people both in the EU and the US.
Mr Martin said Europe has shown "commendable unity, firmness, principled position...and calmness as well" during this week's crisis when US President Donald Trump threatened 10% tariffs on six EU countries which did not back his pursuit of Greenland.
EU leaders are expected express support for Denmark in future discussions with the US regarding Greenland.
'Board of Peace'
The extraordinary EU summit is also expected to discuss the US’s 'Board of Peace', which has controversially issued an invitation to Russian President Vladimir Putin to join.
EU leaders said that the proposal put forward by the US was much "broader" than had originally been anticipated.
This could give rise to legal questions regarding the Board’s compatibility with European law and whether it could undermine the role of the United Nations.
Hungary has said it will join, although many large EU countries and Britain have said they would not join the organisation.
The Taoiseach said the remit of the international 'Board of Peace' is "more extensive than envisaged" by the United Nations resolution that approved it for "Palestine and for the Middle East and for Gaza in particular".
He said Ireland was "very anxious to contribute to peace and conflict resolution in the Middle East and in Gaza".
He said there is a "role for Ireland in respect of those kind of issues", and it will be discussed at the EU Council meeting this evening.
