Writing on X, Tusk said the meeting took place late on Thursday at a military airport in Dublin, with representatives of Poland, the United States, Britain, Germany, France, Italy and EU institutions.
"The Americans informed us about the results of the meeting in Moscow," he wrote.
A government spokesman confirmed earlier reports that Poland was represented by Deputy Foreign Minister Robert Kupiecki, Tusk's national security adviser.
The briefing followed a day of diplomacy.
US mediator Steve Witkoff and Jared Kushner, President Donald Trump’s son-in-law, met Russian President Vladimir Putin in Moscow, then flew to Dublin to see Ukrainian President Volodymyr Zelensky, who was attending a summit of more than 40 European leaders.
Witkoff said after the Kremlin discussions that Europeans would be present at the next meeting.
The Dublin briefing capped three days of negotiations.
Witkoff and Kushner had earlier held two days of three-way talks in Abu Dhabi, which were preceded by discussions with representatives of Germany, France, Italy, Britain, NATO and the European Commission.
Zelensky named three outcomes of the week's negotiations: an agreed prisoner exchange, which he said would be the largest since the war began; a more active role for European representatives, so that they have "an equal seat at the negotiating table;" and preparations for further multilateral meetings.
Putin and Russian officials have signalled, however, that they have not given up their territorial demands.
(ał/gs)
Source: PAP