title: Reakcja państw Unii Europejskiej na rosyjską agresję w Ukrainie. Europa zjednoczona czy podzielona?
abstract: The principle of solidarity is a basic element of social life, inscribing not only the ethics of the Catholic Church but also european culture and documents of the European Union. [107] The aggresion of the Russian Federation in Ukraine, which began in 2014 with the annex- ation of Crimea and continued through military operations carried out from February 24, 2022 inspired the author to write this article and pose several basic questions that she will try to answer. What was there action of the 
journal: Studia de Securitate.