Check out this piece by Robert Koehler at The Marmot’s Hole about how opinions about the origins of the Korean War have evolved over time from the belief that the war started with a North Korean invasion of the South at the instigation of and support of Soviet leader Josef Stalin, to the revisionist view that the United States and South Korea started it all, to the current opinion (based on access to information available following the collapse of the Soviet Union) that it was North Korean leader Kim Il-sung who masterminded the whole thing.