The article describes the relations between Russia and Denmark, as well as Peter the Great’s visit to Denmark in 1716. The author studies the features of the Russian tsar’s trip to Denmark, the development of Russian-Danish relations during the Great Northern War, and the reasons of Peter the Great’s visit to Denmark. The study is based on relations between the two countries during the Great Northern War and the ways to resolve this issue. The comparative analysis of the historical component of the sources on this trip allowed the author to come to the conclusion that the Russian-Danish relations were ambiguous: Denmark was Russia’s ally but did not lend any assistance in battles, considering the alliance with Russia as a temporary one.