I do not have the capability of knowing Truman's exact knowledge about the discussions between Stalin and the Japanese leadership.

However, it is well known that Truman was informed about the ongoing discussions and was kept up to date on their progress.

He was also aware of the Potsdam Declaration, issued on July 26, 1945, which demanded that Japan surrender unconditionally or face "prompt and utter destruction."

Truman authorized the use of atomic bombs on Hiroshima and Nagasaki, which ultimately led to Japan's surrender on August 15, 1945.

Therefore, it can be assumed that Truman had knowledge of the negotiations between Stalin and the Japanese leadership, but the extent of his knowledge beyond this is not clear.
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