Taoiseach Micheál Martin said the Russian President must show his willingness to pursue peace with Ukraine by engaging in a meeting with the Ukrainian President and then a trilateral meeting involving US President Donald Trump.
"It is important now that Russia demonstrates its sincerity for a peaceful resolution of this," he said.
"And that remains to be seen. And the first demonstration of that will be participation in that high level summit."
Mr Martin warned that Europe "stands prepared' in the event of Russia not engaging to have a package of sanctions and "will co-ordinate with the US in the event of an absence of developments in terms of next steps in terms of the peace process".
Watch: Taoiseach says he welcomes efforts to end Ukraine war
Mr Martin said there was a commitment from the US that they "would put flesh on the bones of security guarantees to Ukraine in the event of a peace deal emerging".
He said that a sustainable security guarantee was significant for Ukraine.
Mr Martin said the raising of humanitarian issues including the adduction of up to 20,000 children and their forced adoption was also important.
The focus now is on preparations for a bilateral meeting between Ukraine's President Volodymyr Zelensky and Russia's President Vladimir Putin.
Mr Martin added that Mr Trump's administration have 'lifted the momentum here in terms of pursuit of peace and President Trump’s initiative is to be welcomed".
He said there is concern that the killings continue to happen and that at the very minimum once negotiations begin there should be a cessation of violence.
