Until the 1960s, the traditionalist vision was predominant. The traditionalists placed the responsibility for the Cold War on the expansionist policy of the Soviet Union under Stalin, shortly after the Second World War. After the defeat of Nazi Germany, the Soviet Union tried to dominate its neighbours and set up a sphere of influence in Eastern Europe. The aggressive intentions of the Soviet Union were, among other things, reflected by the Communist coup in Czechoslovakia, the Berlin Blockade and the attack by North Korea on South Korea in 1950. According to the traditionalists, it was this Soviet expansionist policy that forced the United States to intervene, which subsequently led to the Cold War.
Sources:
https://historiana.eu/case-study/cold-war/traditionalist-vision
"The Cold War", Cambridge Perspectives in History, Mike Sewell, Cambridge University Press, 2002, pp1-7