It's true that Churchill didn't like Communism, but I don't think he would have been able to convince Britain to jump back into a massive conflict so soon after beating the Germans- besides which, I think he was replaced as PM not long after the cessation of hostilities (can't remember for sure, though I know he was re-elected for a while as well).
As for a Japanese army, I don't really think so. Although there's no love lost between Japan and Russia, the Japanese were under strict limitations on their military development after the Second World War, and I don't think anybody would have been willing to allow them to re-arm- even for use as a proxy army.
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