No, because Lenin died of natural causes in 1924 after suffering a stroke in 1922. After Lenin died there was uncertainty as to who would lead the country. The four main people involved were Leon Trotsky, Grigory Zinoviev, Nikolai Bukharin and Joseph Stalin. Stalin allied himself with Zinoviev and ousted Trotsky. Then he allied himself with Bukharin and ousted Zinoviev. By this time Bukharin realized he had been duped by Stalin and that he, Bukharin had no power base. Stalin was able to seize control of Central Committee and have full power to rule.
There is a possibility that four high ranking members of Stalin's government poisoned Stalin for fear that Stalin's paranoia was getting out of control and they might be removed from their positions and either exiled, imprisoned or executed. Supposedly they secretly gave him medication to induce a stroke, which is how he died.
At first, lenin... then lenin died and Stalin screwed with the succession and seized power.
Joseph Stalin
Joseph Stalin opposed Trotsky in their struggle for power after Vladimir Lenin died in 1924.
Joseph Stalin
First Leon Trotsky, then Grigory Zinoviev and then Nikolai Bukharin lost in the power struggle after Lenin's death. All three of them and Joseph Stalin had claims to be Lenin's successor, but Stalin outmaneuvered them all.
Simple answer Joseph Stalin
Joseph Stalin come to power in Russia after the Russian Revolution in 1917. He was the secretary general of the communists party which did not want Leon Trotsky to ascend to power after the death of Lenin.
Joseph Stalin gained more power than any other person after Lenin died. In the last year of Lenin's life, Stalin led Russia along with Lev Kamenev and Grigory Zinoviev. Then Stalin gradually ousted Leon Trotsky, Nikolai Bukharin, Zinoviev and Kamenev from consideration as Lenin's sole successor. In 1929, Stalin became the sole power in the Soviet Union.
It was split by Bolshevik party (run by Lenin), and the Duma (Alexandar-Provisional Government). ^_^
Joseph Stalin along with Grigory Zinoviev and Lev Kamenev tried to take power from Lenin when Lenin was disabled by strokes. These three ran the government in Lenin's absence as he recovered and continued to do so secretly even when Lenin returned to work. The three would make governmental decisions in secret meetings after the general meetings that Lenin attended. Stalin restricted access to Lenin when Lenin was recovering. Stalin's biggest move for power was after Lenin made him Secretary General of the Communist Party. Once in that post, Stalin placed people loyal to him in many governmental offices. Stalin never did unseat Lenin, but he certainly tried and succeeded to take at least some of Lenin's powers away.
Stalin never "joined the Soviet Union." Vladimir Lenin created it in 1922 when Stalin was one of several Commissars in Lenin's government. After Lenin died Stalin and others took over running the Soviet government. Later he had total control of it. Why did he take control over it. Stalin was always power hungry and controlling. He saw his chance at surviving Lenin after Lenin had his disabling strokes and stepped in to take that control of and exercise power over a country.
No, Lenin died in 1924. The USSR did not create the Warsaw Pact until after World War II. Joseph Stalin was in power at that time.