How did the relationship develop between the USSR, on the one hand, and the United States

How did the relationship develop between the USSR, on the one hand, and the United States and Great Britain, on the other, during the Second World War?

Since the beginning of the war, these countries had cool relations, because the USSR and Germany concluded a non-aggression pact and divided spheres of influence – this is how Poland was divided, and the three Baltic states and the territory of Bessarabia were annexed to the USSR. In the Soviet-Finnish war, Finland was politically supported by Western countries, incl. USA and Britain.
After June 22, 1941. relations changed dramatically – the United States, Britain and the USSR formed an anti-Hitler coalition and became allies.