"Gitanas Nauseda underlined Lithuania’s solidarity with Poland which today bears the brunt of the hybrid attack", the Lithuanian president's office said in a press release after his remote meeting with Andrzej Duda and Volodymyr Zelensky.
"The president noted that we needed to keep the EU and NATO focused and maintain proper solidarity and a united response to the hybrid attack," it said.
In their trilateral statement, the three presidents "expressed their commitment to further developing strategic partnership between Ukraine, Lithuania and Poland based on shared values and common interests in the fields of security and defense, economy, energy, and other areas".
They also "reiterated their commitment to maintaining and developing a close partnership within the Lublin Triangle format".
Nauseda said during the meeting that "Lithuania supports Ukraine's sovereign choice and European aspirations, which are today more important than ever".
"The declaration and recognition of Ukraine's independence 30 years ago became an important milestone on the way to a full-fledged reunification of Europe, and today's topical issues only bring our countries and Europe as a whole closer together," he was quoted as saying in the press release.
More than 4,200 irregular migrants have crossed into Lithuania from Belarus illegally so far this year.
Lithuania and other Western countries accuse the Minsk regime of orchestrating the unprecedented migration influx, calling it "hybrid aggression".
Lithuania has declared a state of emergency on its frontier with Belarus in response to rising numbers of irregular migrants seeking to enter the EU.