Topics include joint military exercises and tensions in neighbouring Belarus, public broadcaster Polish Radio reported.
The meeting started on Wednesday evening with a working dinner, said Paweł Soloch, head of the Polish president’s National Security Bureau (BBN).
On Thursday, the schedule includes discussions, plenary sessions and a meeting with Polish President Andrzej Duda, Soloch told reporters.
The Warsaw talks follow a video conference call by the three countries’ foreign ministers in late January.
In July last year, top diplomats from Poland, Lithuania and Ukraine met for three-way talks in the eastern Polish city of Lublin to discuss regional security and efforts to fight the COVID-19 pandemic.
Poland’s then-Foreign Minister Jacek Czaputowicz told a news conference that the three countries aimed to “create a flexible and effective platform of cooperation in Central Europe,” including through regular trilateral meetings.
The three foreign ministers together visited a multinational military brigade based in the Polish city.
The joint Lithuanian-Polish-Ukrainian brigade, more than 4,000-strong and known as LITPOLUKRBRIG, achieved full operational capability in 2016.
It was formed to conduct peace-support and crisis-response operations and to help enhance military cooperation between the three countries amid tensions with neighbouring Russia, according to officials.
Source: IAR, PAP