Zelensky's visit began with a one-on-one meeting with Polish Prime Minister Donald Tusk at his office in central Warsaw, broadcaster TVP Info reported.
The two leaders were later expected to engage in talks with a broader group of officials from both countries.
After the talks at the Polish Prime Minister's Office, Tusk and Zelensky were scheduled to hold a joint news conference.
Later in the day, Zelensky was scheduled to meet with Polish President Andrzej Duda and Warsaw Mayor Rafał Trzaskowski, public broadcaster Polish Radio’s IAR news agency reported.
Although Poland has been one of Ukraine's staunchest supporters since Russia's invasion in 2022, historical tensions, rooted in events from World War II, have strained relations between the two neighbours.
According to Polish historians, more than 100,000 Poles were killed in massacres carried out by Ukrainian nationalists from 1943 to 1945.
Poland has long sought unrestricted access for its experts to the possible burial sites of the victims, aiming to conduct exhumations and provide proper funerals.
On Friday, Poland's Tusk hailed what he called a "breakthrough" in bilateral relations, announcing that Ukraine had agreed to permit the first exhumations to proceed.
Last month, Tusk and Zelensky met in the western Ukrainian city of Lviv, where the Polish prime minister promised to "do everything" to help Ukraine join NATO.
"We will do everything we can to bring Ukraine's NATO membership closer to reality, but we know it will not be easy," Tusk said at the time, as quoted by his office.
He also promised that Poland would work to accelerate Ukraine's accession to the European Union.
He described Ukraine's war with Russia as "part of a great clash of civilizations" and affirmed Poland's long-term commitment to supporting Kyiv.
In November, Tusk and Zelensky spoke on the phone to discuss Warsaw's support for Kyiv against Moscow's ongoing full-scale invasion.
Zelensky at the time shared his "hopes for Poland’s presidency of the EU Council" in the first half of 2025 "and their support in advancing Ukraine’s EU integration, including opening the first negotiation cluster and moving forward with others in parallel."
He also thanked Tusk "for using his extensive personal connections to advocate for Ukraine’s NATO membership and for continued defense support."
Polish Prime Minister Donald Tusk. Photo: PAP/Piotr Nowak
Russia invaded Ukraine by land, air and sea on February 24, 2022, starting the largest military conflict in Europe since World War II.
Wednesday is day 1,056 of Russia's war on Ukraine.
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Source: IAR, PAP, Reuters