The object of this research is the foreign policy of Denmark in the 1980s. The subject of this research on the one hand is the ideological foundations of Denmark's foreign policy during this period, which were strongly affected by the ideas of European social democracy, and on the other hand – the influence of the Danish Parliament (Folketing) upon the formation of Denmark’s official position on the issues of European security discussed within the framework of NATO. Denmark’s refutation of neutrality after the World War II and its entry into NATO in many ways determined the foreign policy position of Denmark throughout the Cold War as a small European state that perceived the Soviet Union as a threat to national security. At the same time, the desire of Denmark of maintain maximum flexibility and avoid making far-reaching commitments within the framework of NATO, led to the fact that Denmark was often perceived as an unreliable and inconvenient ally. The period from 1982 to 1988 indicates the Atlantic dissidence of Denmark and simultaneous improvement of relations with the Soviet Union), when Denmark’s representatives in the NATO sessions, being obliged to take into account the position of the parliamentary majority in the Folketing, were forced to make reservations to the final documents of the sessions, expressing disagreement or criticism of implemented measures. Among the Russian scholars dealing with the history of Denmark, this period has not yet received wide coverage. This article is an attempt to describe and explain the causes and consequences of the period of the “policy of reservations” for Denmark’s foreign policy in the context of the end of Cold War and in the conditions of transition towards the post-bipolar system of international relations.