“…The European Economic Community/European Union was born as an economy-oriented organization, which was to facilitate rebuilding of the Old Continent after WWII through extensive cooperation, particularly in trade� However, the appetites of the state leaders were growing along the progress of the integration processes; the economic success was an argument for further integration of the European countries� Due to this, the organization was given the ability to make decisions and influence decision-makers at the national level in subsequent spheres that earlier were the sole prerogative of states� Still, for many years EU members determinedly guarded their competences regarding broadly understood security, predominantly defence� Successive attempts to accelerate integration in this area were not effective enough to develop a real common defence policy� One of the last initiatives, Permanent Structured Cooperation (PESCO), is supposed to help change this situation� It is -ABSTRAKT -Wspólnota Europejska/Unia Europejska zrodziła się jako organizacja ekonomiczna, która poprzez pogłębioną współpracę, zwłaszcza handlową, pozwolić miała na szybką odbudowę Starego Kontynentu ze zgliszczy wojennych� Apetyty przywódców państw europejskich rosły jednak w miarę postępujących procesów integracyjnych -sukces ekonomiczny napędzał wolę dalszej pogłębionej integracji państw� Ten stan rzeczy pozwolił wyposażyć organizację w możliwość decydowania i wpływania na decydentów krajowych w kolejnych sferach dotąd wyłącznej aktywności państw� Niemniej na przestrzeni lat państwa unijne zazdrośnie i z wielką determinacją strzegły kompetencji dotyczących szeroko pojmowanego bezpieczeństwa, w tym nade wszystko obronno-ści� Kolejne próby przyspieszenia integracji w tej materii okazywały się nie na tyle skuteczne, by można było mówić o realnej wspólnej polityce obronnej� Jedna z ostatnich inicjatyw -PESCO -ma pomóc odmienić tę sytuację� Konieczne There were three factors that led to closer cooperation in the matters of EU security and defence: a) publication of the European Union Global Strategy (EUGS) in 2016; b) Great Britain's decision to leave the EU; and c) antipathy of some of EU states to President Trump� Since 2016, studies on the common security and defence policy of the EU have been focusing primarily on two aspects: 1) analysing the EUGS (Barbé & Morillas, 2019;Tocci, 2016;Biscop, 2016, pp� 91-100) and 2) functioning of EU defence after Brexit (Duke, 2019;Svendsen, 2019;Deschaux-Dutard, 2019)� The EUGS implementation plan, adopted by the Council in November 2016, initiated the process of developing relevant military, civilian and industrial instruments as well as financial mechanisms; a crucial element of the military aspect is to be Permanent Structured Cooperation (PESCO)� As noted by Sven Bishop, "[s]uccess is obviously not guaranteed, but seems more likely in this case than in the past" (Biscop, 2018, p� 161)� The success of PESCO will depend on many actors involved in shaping EU security and defence policy (Jopp & Schubert, 2019;Blockmans & Crosson, 2019), yet the most crucial components are the will, attitude and involvement of the participating states� This article aims to study the involvement of EU member states in the implementation of PESCO projects� The first part characterizes permanent structured cooperation, including its legal foundation and premises, commitments that must ...…”