The Soviet invasion of Ukraine was a major offensive by the Ukrainian Front of the Red Army against the Ukrainian People's Republic (UPR) during the Soviet–Ukrainian War. The invasion was first planned in November 1918, after the Council of People's Commissars of the Russian Soviet Federative Socialist Republic annulled the Treaty of Brest-Litovsk, and was launched in the first days of January 1919, with the occupation of Kharkiv. Its aim was to join Ukraine to the RSFSR, as the country was of significant economic, demographic and strategic importance for the Bolsheviks. In the longer term, the capture of the Black Sea coast was to prevent an intervention by the Allies in support of the Volunteer Army. Finally, the Bolsheviks intended to extend the area they control as far as possible to t