The Polish and Ukrainian heads of state spoke on Tuesday afternoon, according to officials.
Duda and Zelensky discussed the latest developments in the war, including Russia's missile attacks that have killed Ukrainian civilians and damaged the country's infrastructure, Polish state news agency PAP reported.
The two presidents talked about defence cooperation, measures to "strengthen Ukraine's air shield" against Russia, ways to "ensure the EU's financial and political support for Ukraine," and the upcoming NATO summit in Washington, according to officials in Kyiv.
Another topic was Ukraine's bid to join the EU and NATO, the PAP news agency reported.
Zelensky "expressed gratitude for the consistent and unwavering support of Ukraine by Poland as an unwavering ally of our country on its path to joining the EU and NATO," his office said.
Ukraine's president stated: "Our common border should be a true European border. A border of unity. There should be no borders between our people."
Zelensky added: "I am convinced that the future of Ukraine and Poland lies in unity, mutual support and mutually beneficial cooperation."
Tuesday is day 685 of Russia’s war on Ukraine.
Russia invaded Ukraine on February 24, 2022, launching the largest military campaign in Europe since World War II.
Source: president.gov.ua, prezydent.pl, IAR, PAP