The meeting is set to be hosted by Polish Foreign Minister Zbigniew Rau as part of Poland's turn at the rotating chairmanship of the Organization for Security and Cooperation in Europe (OSCE).
Rau on Sunday called for an immediate ceasefire between Russia and Ukraine to let evacuate civilians and deliver humanitarian aid to the city of Kyiv.
In a tweet on Monday, he said that "it's high time to welcome Ukraine into the EU community" as "the Ukrainians heroically defend themselves against Russian aggression."
He vowed that Poland "will provide all necessary assistance to Ukraine's accession process."
The Weimar Triangle group was set up by Poland, Germany and France in the early 1990s to help overcome divisions in Europe by integrating Poland with European and Euro-Atlantic structures. That goal was achieved through Poland's accession to NATO, and then to the European Union.
Today the Weimar Triangle is a platform for consulting and discussing common positions on key policy issues within the European bloc, with talks taking place at various levels of government administration, according to officials.
Earlier this month, Poland's President Andrzej Duda urged a united stance by the Western community in support of Ukraine during talks with France's Emmanuel Macron and Germany’s Olaf Scholz in Berlin.
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Source: PAP