Speaking at a joint news conference after the talks, Tusk said that Poland and Estonia had "convergent views on key issues determining the future of Europe."
"The top priority is the security of our countries, our region and all of Europe," Tusk declared.
"Poland and Estonia have been very active in various initiatives that support Ukraine, especially when it comes to weapons and technology," he told reporters.
"We will persist in these efforts," he declared, as quoted by his office.
Kallas wrote on the X social media platform after the meeting that she and Tusk "emphasised that the free world must demonstrate the will to defeat Russian aggression."
She added that Ukraine "needs both our swift military aid and long-term support."
She voiced hope for deepening her country's "excellent cooperation with Poland on defence" and in "countering hybrid threats."
The meeting of the two leaders came as part of a broader effort by the government in Warsaw to strengthen ties with its regional partners amid Russia's ongoing invasion of Ukraine, according to officials.
Russia invaded Ukraine on February 24, 2022, starting the largest armed conflict in Europe since World War II.
Thursday is day 778 of Russia’s war on Ukraine.
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Source: IAR, PAP