The international analysis carried out in the first two decades after the fall of communism brings us new information regarding the evolution of the influence of NATO on European security and politics. This article aims to analyze the role of NATO in ensuring European security seen through the research of the most significant German think tanks. It is important to underline the fact that the concept of "security" is not unanimously understood by the international environment. After the collapse of the bipolar system of international relations, various structures engaged in the study of international relations set themselves the goal of identifying the signs of a newly emerging system and offering their assessments to the actions of the main actors trying to participate in its formation. The USA set the course for the construction of a unipolar international system, which would be guided by the USA. This approach is most often observed in the studies of American experts on global security problems. © 2021 Editura Universitaria Craiova. All rights reserved.