Simple enough question. Japan doesn't surrender after the losses of Manchuria, and something goes wrong with the atom bomb and they end up not being able to flatten Hiroshima, Nagasaki, or any other urban centres. So, the US and the Soviets invade mainland Japan. Russia would most likely attack Hokkaido, yes?
If so, what beaches would they most likely assault? Would they land near Iturup and Sakhalin, or would they land their forces just a little way away from Sapporo?