August 10, 1945, the Japanese inform the allies that they intend unconditional surrender. The Emperor's public, formal statement was made August 15, and the surrender was signed September 2, but August 10 was the day Japan acknowledged it could not continue, and the day the western allies began to restrict their troop movements because of the anticipated surrender.
At the same time, the Soviet Union was sweeping through Japanese occupied Manchuria, and began attacking the Japanese Navy in and around Korea, setting the conditions for the Soviet invasion in Korea, which would result in establishing the 38th parallel as the boundary of Soviet vs. western controlled Korea. Not that anything important ever happened as a result of that.