The ultimatum of the Council of People's Commissars to the Ukrainian Central Rada is an ultimatum of the Bolshevik government of Russia (Council of People's Commissars) representative body of the Ukrainian People's Republic (Central Council of Ukraine). Written under the signature of Vladimir Lenin and Leo Trotsky. Transferred to Kyiv 17 [O.S. 1917] December. The document demanded from the Ukrainian government unconditional assistance to the Bolsheviks in Ukraine. Deflected Ukrainian Central Council signed by Volodymyr Vynnychenko and Symon Petliura. Became a reason to start Soviet–Ukrainian War.