Introduction: "We are pleased to present our readers with this recent issue of our journal “Security. Theory and Practice”. This time, it features a vast array of studies that look at issues related to security strategies. The Articles and Materials section opens with the article by Wulf Lapins, entitled EU-Strategien im Wandel von Zeit und Situation, which offers a synthetic approach to the developed and implemented strategies of the European Union. The paper by Joachim Diec Demography as a security strategy factor in Poland and the Russian Federation focuses on the perception of demographic security in Poland and Russia as a major facet of social and state security. The author concludes that the Polish political narrative and the declared set of state goals focus more on the social sphere, while the Russian rhetoric and politics are more state-oriented. The contemporary rebuilding of the sphere of influence of the Russian Federation, covering the area of the so-called “near abroad”, has been scrutinised by Anna Jach in her article A new “gathering of Russian lands”: Russia’s return to imperialism."(...)