The problem of migration, which affects the international conjuncture and has been mentioned frequently in the literature over the recent years. Migration has become a major security problem not only for the receiving country but also for the sending countries. While the states acted with the classical sense of security with the 1648 Westphalia system, there were especially critical approaches that wanted to change this perception. Aberystwyth School, one of the critical theories, also argues that this perception should be changed. According to this school, instead of a rigid border and military security, the changing and deepening security problems should also be addressed. The immigration problem, which became more prominent in the international conjuncture, especially after the Syrian civil war, proves critical security theories. In this article, we tried to explain security problems posed by the immigrant problem in Europe on the Polish example following the Russia-Ukraine crisis.Thus, by referring to the Aberystwyth School principles on Ukrainian immigrants, a diversified security perspective was provided.