Thanks a lot for this link. The followup article <https://www.nationalww2museum.org/war/articles/japans-surrender-military-coup-1945 https://www.nationalww2mus

Thanks a lot for this link. The followup article <https://www.nationalww2museum.org/war/articles/japans-surrender-military-coup-1945 https://www.nationalww2museum.org/war/articles/japans-surren...> mentions that while the Soviet Union didn't pose much threat to the home islands, it would and did steamroll the armies on the Asian mainland. Ensuring these forces actually abided by to the surrender terms was crucial. So atomic bombs threatening Japan proper and the Soviet Union threatening the land forces in Asia provided the "cover" for the surrender terms.