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The Russian revolutionary Lenin, long in political exile in Switzerland, was spirited across Europe in a sealed train by the German governement. His arrival in St. Petersburg quickly escalted an already volative situation into outright revolt. The Czar was forced to abdicate, the monarchy destroyed. Instead of signing a peace treaty with Germany/Austria the new Russian 'governement' just decided to stop the fighting. German units wished a more formal end of the conflict so they pressed forward, occupying parts of the Ukraine and Latvia. Not wishing to see further territorial losses, the Russians at last agreed to sign a treaty with Germany ending the fighitng.
Lenin chose a very significant time to return from exile, what was his purpose and whay happened upon his return?