The Three Seas Initiative (3SI) is a relatively young format of regional cooperation in Central Europe. It is an example of multilateral diplomacy carried out by heads of state. The main goal of 3SI’s activi- ty is the development of energy, transport and digital infrastructure in the region. In recent years, the extension of the subjective and objective scope of the Three Seas cooperation has been noticeable. The governments of the Initiative countries are becoming more and more important, while the business, expert and social components are strengthening. External actors with the status of observer or participating partner are also of strategic importance for the functioning of 3SI: the US, the European Commission, Germany and Ukraine. The aim of the article is to analyze the origins and functioning of 3SI in the years 2016-2022.
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