Cross-Border Security: The Case of the Eastern Border of the Republic of Poland and the European Union

The issue of cross-border security is often overlooked in doctrinal discussions focusing mainly on international or national – internal issues. With this in mind, the author of the article attempts to formulate a theoretical view of cross-border security and analyze its main threats. This material was analyzed on the example of the eastern border of the Republic of Poland and the European Union. The first is a creative search for the definition of cross-border security in the aspect of international and national – internal conditions. The second part is devoted to the presentation of the main threats to cross-border security in this area in the years 2016–2021. Cross-border security threats related to illegal immigration, smuggling of weapons, ammunition, explosives, drugs and products of the alcohol and tobacco industries were analyzed in details.