The Russian-Ukrainian war is not just a regional war. It is the war that marks a rupture in relations between Russia and the West, a war that will have profound repercussions for both Europe and the world. The invasion of Ukraine by the Russian Federation tends to become the most important military conflict since the end of World War II. Thus, the actions of the Russian Federation in Ukraine become a topic of discussion not only in the chancelleries and in the speeches of Western leaders, but also constitute a topic worthy of consideration for the academic community. This article aims to highlight the causes of the emergence of the Russian-Ukrainian war. The article will highlight the actions taken by the Russian Federation in Ukraine over three decades.