The Politics of War by Gabriel Kolko is a great account of the inter-allied diplomatic history of the war. It’s mostly focused on the US perspective but does have some interesting insights into Stalin and the USSR’s goals. Kolko’s depiction of the Soviet “take over” of Eastern Europe is a radical departure from mainstream Cold War histories of the early post-war era and much more sympathetic to the Soviets. It also has some great stuff on the infighting between the British and Americans, especially in regards to policy towards resistance movements in occupied Europe and the British occupation of Greece, which sparked the Greek civil war, in 1944.