As a consequence of Russia’s aggressive actions – initially with regard to the annexation of Crimea, and the beginning of the armed conflict in eastern Ukraine in 2014 – many European Union countries have revised their current security and defence policies. The ongoing Russian invasion of Ukraine, initiated on 24 February 2022, only strengthened this tendency. For Poland, one of NATO’s major eastern flank states, the need to improve the management of national security that corresponds to the challenges and threats that lie ahead has become self-evident. The goal of this article is to look at the assumptions of the defence policy of the Republic of Poland, and to evaluate the country’s defence potential based on the implemented modernisation schemes.