Hehe, Stalin and Churchill mistrusted each other. Some facts:
1. Since the deal with Hitler, the USSR was feeding the German war-machine, - up to the day of Barbarossa. This particularly made Churchill sour through the BoB.....
2. None the less, Churchill saw a potential ally in the USSR, since intellience gave the information that Nazi Germany was planning on the USSR. The UK actually WARNED the USSR about Barbarossa very shortly before it went loose. The warning was discarded.
3. Still, just a few months after the start of Barbarossa, - at the battle of Moscow, the USSR were receiving the first shipments of supplies and arms from the UK. The USA hadn't joined in at the time....The "Allies" between the solstice (21 june) and Pearl harbour (7th of Dec) in 1941 were the Commonwealth and the USSR..
All worth some thoughts...