No they didn't. There is no evidence Stalin was ever in any way, shape, or form serious about invading japan.
Stalin agreed to help the Americans defeat the Japanese within 3 months of Germany's surrender/occupation at the Yalta Conference.
No instead, Russia had started to amass a large force of over 1.5 million men, over 5,500 tanks, and over 5,000 aircraft at it's borders, and in seven days, managed to push well into the Northern part of the Korean Peninsula, taking most of Japanese controlled Manchuria in the process before the surrender of Japan just a short week later.
No, the delay between the bombings of Hiroshima on August 6th and Nagasaki on August 9th, and the Emperor's surrender on August 15th, had little to do with the bombs, and more to do with the fact that other then the Mainland, they had nothing left to fight over.
A little knowledge of history would help before you keep posting useless information.