The Chinese Invasion of Siberia was campaign launched by the Chinese Army. The invason was in response to Russian aggression during the Russo-Sino Border War that occurred days before.
The Invasion was considered the largest failure in history. With over 500,000 Casulites (of 4.8 Million troops) on the chinese side, most dying from the harsh winter. The Russian lost over 78,000 combatants and 120,000 civilians.