The 1936 Constitution is commonly referred to as Stalin's Constitution because of his significant role in drafting the text and providing support for the ratification of the constitution in December 1936, when the constitution was unanimously approved. At that time, it was considered the most democratic constitution and it was presented to the people as the result of all the achievements and victories of the Soviet worker. The 1936 constitution was based on the voluntary association of equal Soviet socialist republics. The alliance emphasized its primacy in inter-republic relations by approving border changes between republics as well as the establishment of new autonomous regions and territories. This provision of the constitution is the legal basis of The decree of the Presidium of the USSR Supreme Soviet transferring the Crimea Oblast from the Russian SFSR to the Ukrainian SSR, adopted by the party leadership in 1954, thus gifting the peninsula to the SSR Ukraine, as a sign of eternal friendship between the Russian and Ukrainian populations. At the time, such a decision had no major consequences for the population of the peninsula, considering that it was an administrative redistribution of territory within the then single socialist republic, but the situation changed with the collapse of the USSR. By reviewing the recent legal history of Crimea, an attempt was made to put the last part of this work into context, which looks at the current topic of the Ukrainian crisis that took place in 2014 and ultimately resulted in the Russian annexation of Crimea. Such a Russian political move in 2014 was condemned by the international community, and this work also analyses the international law institutes that the Russian Federation used to justify its military intervention on Ukrainian territory.