He destroyed Russian Empire.
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.
The German government is the member of the Central Powers of World War 1 that put Lenin on a train back to Russia.
Germany sent him back!
When the Russian Czar stepped down the new provisional government decided to continue Russia's part in WW1 by continuing to fight the Germans. Lenin and his small but powerful Communist Party promised to withdraw from the war as it was causing much destruction to Russia. Lenin had been living in exile from Russia and the Germans promised to get Lenin back into his country if he would end Russia's presence in WW1. The Germans were successful in sneaking Lenin back to Russia and this allowed the Germans to concentrate on the Western Front in France.
Lenin did not have to cross battle lines. He was allowed through Germany and travelled on to Russia by way of Finland, where there was no fighting at the time.
Vladimir Lenin was the leader of Russia from 1917 to 1922. He was a communist, and he turned Russia into the Soviet Union. Lenin was predecessor to Stalin.
If you mean during WW1, while the Provisional Government was in control of Russia, Lenin returned to Petrograd on the 16th April with the help of theGerman government (because the Germans figured that if the Bolsheviks were in power of Russia, they'd withdraw from the war and even if they failed to seize power, the turmoil in Russia could only help Germany's war aims).
Lenin became Russia's leader because Nicholas II was kicked off the throne by Lenin's followers.
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 Communism was a complete diaster for Russia that it is only now recovering from.
Vladimir Lenin lived in Russia.
Lenin was the leader of the Bolsheviks.