Tusk said European leaders had broadly backed the idea of a format known as E5, bringing together Britain, France, Germany, Italy and Poland, along with the leaders of EU institutions, to coordinate Europe's role in the talks.
European Council President Antonio Costa earlier announced that Poland would be among the countries involved in negotiations, alongside France, Germany, Britain and Italy, as well as EU institutions, Polish state news agency PAP reported.
Speaking to reporters before leaving Dublin, Tusk said one of the issues discussed at the summit was who should represent Europe at the negotiating table with Ukraine, the United States and Russia.
"Poland will play a key role in this format," he said, adding that he had received congratulations from several European leaders.
Although the informal meeting did not involve a vote, virtually all participants supported the E5 idea, Tusk said.
He added that the group would be responsible for coordinating the next stages of the negotiations.
Tusk said European countries should avoid making unnecessary concessions to Russia and rejected any changes to Europe's security architecture that would benefit Moscow, as demanded by Russian President Vladimir Putin.
"We will and must talk about peace in Ukraine—a just peace—and about Ukraine's future in the EU and NATO, but we will certainly not agree to changes in Europe's security architecture in Russia's favour," he said, adding that the EU would maintain a united position.
Tusk said Costa should represent the group and present a common European position.
European Commission President Ursula von der Leyen and member state officials, particularly national security advisers, would also take part in the negotiating process.
Poland's representative would be Deputy Foreign Minister Robert Kupiecki, Tusk said.
Poland will not contribute more to US arms for Ukraine
Tusk also discussed Ukraine and regional security during a meeting with NATO Secretary-General Mark Rutte on the sidelines of the European Political Community summit in Dublin on Thursday.
Their talks included the PURL programme, under which European countries finance purchases of US weapons for Ukraine.
Tusk said he had told Rutte that Poland would not contribute additional funding to the initiative at this stage, citing the country's high defence spending, budget deficit and its own security needs.
"We have helped and continue to help Ukraine in a very substantial way," Tusk said. "But in terms of our financial capacity, Poland will not be putting in additional money because we have our own defence and security expences, among the highest in Europe."
Tusk said he and Rutte also discussed plans for establishing a permanent US military base in Poland.
Poland offers to coordinate EU AI policy
Another major topic at the Dublin meeting was artificial intelligence and Europe's ability to compete with the United States and China.
Tusk said European leaders recognised that the continent had fallen behind the two countries in AI development, with consequences for both economic competitiveness and security.
He proposed that Poland coordinate efforts among EU member states to develop a common European policy on artificial intelligence.
"Europe must also build a single market and common regulations in this area if we want to compete effectively with China and the United States," he said.
Tusk argued that Europe should seek global rules to keep AI development within safe limits, saying the technology could pose serious threats worldwide.
But he said Europe would have little influence over global rules unless it became a stronger competitor.
"Nobody will listen to us—to Europe—if we are not sufficiently strong and competitive," he said.
Tusk said Poland was well placed to help coordinate the effort because of its talent in the technology sector.
He cited Piotr Sankowski, a member of Poland's Council of the Future, Mateusz Staniszewski, co-founder and CEO of ElevenLabs, and Rafał Modrzewski, co-founder and CEO of ICEYE.
"Poland has all the capabilities and tools to play a leading role in coordinating such efforts," he said.
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Source: IAR/PAP