[temujin77]

If I recall correctly, even before the war, MacArthur had suggested talks between Washington and Moscow to curb Japanese expansion, but it was generally turned down because the US, much like Britain and France, was distrustful of Stalin. After Japan's attack in the opening days of the Pacific War, MacArthur again cabled the War Department, multiple times, I think. In one of them, he stated "the world situation at the present time indicates that the hopes of civilization rest on the worthy banners of the courageous Russian Army", citing that the Russian effort to stop the Germany Army at the outskirts of Moscow was exactly what they needed to set back the Japanese from the north. His belief was not shared in Washington, though, and as it played out, Russian declaration of war on Japan did not come until the final days of the war in 1945.