Putin has attacked Lenin for creating the Ukraine while idolising Stalin and greater Russian nationalism

Lenin
Stalinism – how the USSR became a bureaucratic nightmare
How and why the 1917 Russian revolution degenerated into the totalitarian and bureaucratic nightmare of Stalinism
Communism and Islam – the Bolsheviks attempt an alliance
Communism and Islam moved closer together in the former Russian empire in the period after 1917 but the alliance didn’t last
Trotsky and the horror of the Holocaust
Leon Trotsky could not have anticipated the horror of the Holocaust as he corresponded with Jewish socialists before WWII