The Soviets did not get along well with the Western allies in WWII. They had a common foe, and that's pretty much it. Any close relationship was PR or diplomacy.
The Soviets continued to be extremely secretive with the West. They wouldn't in general allow shuttle bombing using Soviet-controlled bases because that would mean allowing Western soldiers onto Soviet-controlled soil. Seamen from the Murmansk convoys were restricted heavily in their movements. I've read that the West learned of the late war Soviet heavy tank from captured German documents (but haven't confirmed, so take that with a grain of salt).
The Soviets had tried to make an alliance with France and Britain before the war, and insisted on being able to annex Estonia, Latvia, and Lithuania as part of it. That's one reason negotiations broke down (the other is that France and Britain didn't pursue the alliance with any energy - the British representative didn't get authorization to speak directly to the Soviets until Stalin had decided to ally with Germany).
Soviet-Western relationships, never warm, were going downhill starting roughly with the Warsaw Rebellion, which the Soviets called for in the hope that they could join up with the rebels, and repudiated when the Germans stopped the Red Army. My impression is that Stalin would rather it be thought that he called for the Rebellion to get rid of uppity Poles than it be thought the Red Army couldn't accomplish what it was ordered to do.