Why did stalin want to creat a “buffer zone”?

Stalin wanted to create a buffer zone full of communist satellite nations to prevent another invasion of Russia, similar to what happened during Operation Barbarossa, in which Adolf Hitler had ordered an invasion of the U.S.S.R, costing millions of Soviet Casualties.

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.