The Battle of the Sea of Japan was a conflict that occurred in 20th century, which was waged during Earth's Eugenics Wars. It was considered the turning point in the conflict, as it saw much of Khan Singh's military force being destroyed, and marked the beginning of the end of his superrace. After the battle, the Great Khanate splintered into a dozen factions which started fighting one another, which eventually led to their leaders being hunted down by the planet's governments.