The expression "last Chinese warning" was invented in the United States

In 1950-1960-ies American planes often violated the airspace of China for exploration. Chinese authorities recorded each violation and each time sent out through diplomatic channels, "warning" the United States, but no real action for them should not have, and the expense of such warnings was conducted hundreds. This policy has led to the appearance of the phrase "last Chinese warning" meaning threats without consequences.

via factroom.ru