T. A. Gardner
Thread Killer
The imperial Tsarist government no longer existed when Lenin showed up in Russia, having been overthrown in the February revolution.
Aka, there was no longer any Tsar for Lenin to revolt against when he rolled into Petrograd.
The provisional government of Russia was a coalition government of liberals and democratic socialists. Lenin was another garden variety socialist -- he had played no role in the overthrow of the Tsar, and and the provisional government had no reason initially to think Lenin was plotting the violent overthrow of the provisional government and establishment of a totalitarian government.
You are right about the Germans seeing it as a viable wartime tactic to ship Russian revolutionaries back home.
My point was, and is, the government should have dealt with Lenin and his cronies the old fashioned way but didn't. Yes, the government was in disarray at the time and that's largely why the Communists succeeded.