USSR’s attack had no real strategic or tactical military value or purpose. The statement that 650 were killed or wounded is unremarkable when related to WWII combat involving the Soviets.
The only reason USSR attacked was so they could have a “piece of the pie of post-war Japan.” They wanted northern Japanese islands as “war reparations.”
The Soviets had as much to do with our victory over Japan as the Italians did with the Germans defeat of France in 1940.
I have had liberal, hate America professors tell me that the Soviet invasion of Machuria was the REAL tipping point in getting Japan to surrender in WWII. Its absolute BS. That viewpoint only comes from a pre-concieved notion that America dropping atomic bombs on Japan was bad.
The Soviets controlling Manchuria gave a safe haven to Mao’s army at the very least. I would call that a strategic gain.