The Russians carried on for a few more weeks past atom bomb surrender in order to seize Manchuria
Russia agree to declare war on Japan three months after VE Day. (Approximately, I guess)
The U.S. dropped one bomb on Hiroshima on August 6th, and Japan did not surrender. Remember, the conventional bombing of Japan did more damage than the atomic bombing.
Russia invaded Manchuria at midnight August 9th, and sliced through the Japanese force. Japan was already afraid of Russia after the 1939 battle of Khalkhin Gol.
Japan's council voted to surrender after that. They much prefered being occupied by the U.S. then occupied by the USSR, even partially.
The council never had surrender before they ever considered the bombing on Nagasaki.
Dropping atomic bombs on Japan had nothing to do with their surrender.