(ANSA) - LUBJANA, 20 APR - Slovenia will celebrate the 20th anniversary of its entry into the European Union on Monday with heads of state from neighboring countries. A statement from the office of the President of the Republic, Nataša Pirc Musar, disclosed that the presidents will discuss the path their respective countries have walked in the European family and the challenges the EU is facing, taking into account the changing geopolitical conditions in the world and the neighborhood. Slovenia remains a staunch supporter of EU enlargement to the Western Balkans. Italian President Sergio Mattarella, Austrian President Alexander Van der Bellen, Hungarian President Tamás Sulyok, and Croatian President Zoran Milanovic will attend the event at the Brdo estate, a few kilometers from Ljubljana. (ANSA).