Germany hoped Lenin would be disruptive and stir up trouble in Russia in order to spark a revolution that would eventually take Russia out of World War 1, so it sent Lenin back to Russia. This would permit Germany to concentrate its military forces on other fronts instead of having to split them between two fronts. The strategy succeeded quickly since Lenin arrived in Russia in April 1917 and by October 25, 1917 (old style Russian calendar; November 7, new style) engineered the coupe that toppled the Provisional Government . In March 1918, Lenin, Russia signed the Treaty of Brest-Litovsk ending Russia's participation in World War 1.
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The February 1917 Russian Revolution brought Lenin back to Russia. He had been living in Switzerland at the time and the revolution took him by surprise. The German High Command arranged for Lenin to be transported from Switzerland to Russia in a diplomatically sealed train. The Germans wanted Lenin to create more revolutionary disruption in the hope that a new Russian government would get Russia out of World War I.
Lenin and the Bolsheviks came into power on October 26, the culmination of the two day October Revolution. Prior to that, the Russian Provisional Government was in power. Arrest warrants were out for Lenin since July, 1917 and he had to flee the country to Finland to avoid capture. He snuck back in under disguise to organize the October insurrection which brought him and the Bolsheviks into power.
Stalin was imprisoned and exiled several time in his life. He was arrested and jailed outside Baku in Bailov Prison in March 1908. Then he was sent into internal exile but escaped. He was recaptured on March 23, 1910 and again locked up in Bailov Prison and again sent into exile. Once again he escaped and went back to St. Petersburg. On September 9, 1910 he was caught a third time, imprisoned and on December 25 sent back into exile. Stalin managed to get away from the town he was exiled to, but on February 23, 1913, he was again arrested and this time sentenced to exile in a particularly disagreeable town in Siberia, which is where he stayed for the next four years until the February Revolution in 1917 toppled the Tsar. With no Tsarist forces to arrest him again, Stalin got on a train back to St. Petersburg.
The German government is the member of the Central Powers of World War 1 that put Lenin on a train back to Russia.
It was smart for Germany to sneak Lenin back into Russia because they were currently at war with Russia. Germany wanted Lenin to take Russia out from the inside, creating a rebellion that would collapse the government and lead to German victory.