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Stalin came to power in stages after the death of Lenin (1924). By 1928 Stalin was the sole dictator of the USSR.
Vladimir Lenin served as leader of soviet Russia from 1917 till his death in 1924. From 1922 he also served as Premier of the Soviet Union and was later succeeded by the famous communist leader Stalin.
Stalin's chief was Vladimir Lenin during the years before the Russian Revolution and until Lenin's death.
Technically, Vladimir Lenin was leader of Russia until his death in January 1924, even though he was completely disabled by a stroke and was not able to do anything. After Lenin died and for the rest of 1924, Russia was led by a trio of Joseph Stalin, Grigory Zinoviev and Lev Kamenev. Joseph Stalin was not the sole rule until much later.
Lenin felt that Stalin was far too harsh and that he would not make a good leader, but after his unexpected death in 1924, Lenin did not name his succesor, and Stalin took that chance to take power.
Lenin's last wish was that the Communist Party find some way to eliminate Joseph Stalin from his positions of power within the Communist Party so that Leon Trotsky, rather than Stalin, would succeed him as leader of the country on his death.
Stalin wan't a president, he was the 'General Secretary of the Soviet Union'. But he was the de facto leader from 1924 after Lenin's death, until his own death in 1953. By the way; its the Soviet Union, not 'reunion'.
After the death of Lenin
Joseph Stalin was the second Soviet leader and replaced the original leader Lenin upon his death. Stalin led the Soviets to victory in WW2 and thru the Korean War in 1950 through 1953 until his death in March 1953; the Korean War ended by Armistice in July 1953.
Following the death of Vladimir Lenin in 1924, Joseph Stalin rose steadily into the position of supreme power in the Soviet Union. Gathering allies to his side while gradually eliminating his enemies, Stalin's rule was absolute by the early 1930s, and he would go on to rule as Marxist dictator until his death in 1953.
General Secretary
He was put in a shrine by Joseph Stalin.