In Russia, the Czar was a bad leader and hadn't addressed the concerns of the people, but As usual you were given the WRONG answer about the Communists taking over from the Czar in Russia. The Czar abdicated and turned the government over to its version of a "Parliament" called (the spelling is wrong here, but is pronounced) Duma. This was a weak government that the Communists could come in and destroy instead of just "take over". The communists basically murdered everyone who opposed them then, for no decent, moral or justifiable reason, murdered the former Czar, his wife and their children. Because the girls in the family had hidden jewels in their clothing they were stripped first then bayoneted. The 12 year old sickly child of the former Czar was found still alive after the initial attempt at the mass slaughter so the head Communist on site walked up and shot him in the head with a pistol.
This was not an isolated act by deranged or "combat excited" people such as Mi Lia in Vietnam. this was the NORM, the WAY.... of the Communists, both then and now.
In China it was different. There you had an uneducated populous that had no idea what they were doing. The last Emperor had been out of power for a long time (actually, he never really had any power except in the forbidden city around his palace). The Civilian government did little or nothing to help the people and the Communists told the peasants that they would help them. Similar to the Soviets, but not identical, the Communist leaders murdered their way to the top and simply killed everyone that disagreed with them. But LIKE the Soviets, when new leaders came to power, most to the former Communist leaders were killed off so there would be no Competition (like the North Vietnamese killing off all of the head people of the Viet Cong after South Vietnam fell).
Luckily for the former Emperor, Po Yi, for SOME reason that we haven't found yet, the Communists wanted him alive to "show how their re-education system worked", and he was allowed to live after getting out of prison. He worked as a gardener or at a greenhouse.