Strategic partnerships are an essential tool of the common foreign policy of the European Union (EU), which should help fulfil its strategic interest – to be an influential global actor, to share responsibility for global security, and together with partners to respond to the current global challenges. Considering that the EU has not yet defined the nature of the strategic partnership, the first objective of this paper is to identify the instrument from a general perspective and to distinguish it from the default category of cooperation. Linking strategic partnership with legal standards, however, allows for the setting of certain criteria of the concept of strategic partnerships for the EU with other key countries and to determine the variability of possible approaches to the specific concept. To define these criteria and the variety of strategic partnerships set by these criteria, is the second goal of the article. If an adequate alternative approach to the concept of the EU is assigned to each individual strategic partner, which is the third objective of this paper, the results indicate the significant diversity of strategic partners of the EU. Based on obtained results, it can be concluded that in order to clarify the concept of the EU’s strategic partnership, it is necessary to take steps that will lead to a gradual convergence of existing forms of strategic partnerships and their focus on strategic issues.