system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] How did Doctor Doom remove Latveria from the grasp of the Soviet Union?

At the end of The Second World War the USSR essentially annexed eastern European countries into satellite states. This would have included Latveria. Even with his genius could Doom have overthrown the puppet ruler and established a truly independant nation while surrounded by Warsaw Pact countries.
gpt
A combination of rough terrain and separate culture made it a difficult nation to integrate in the first place.  Troops alone were not enough. When the seperatist movement began, Doom had the resources to create resistance forces that would make it costly for the USSR to hold.  

That's the stick, but he also used the carrot.  His genius could provide valuable tech to the  Soviets who suffered from a chronic inferiority complex in trying to keep up with the West.  If releasing a small, useless bit of land to him could secure his good will and assistance they would seriously consider it.