I was drawing logical conclusions from your definition of "China". First you said that "China" meant the entire known civilized world, but now you are saying that this doesn't include Japan. OK!
Would you agree that the Ming dynasty invaded and occupied northern Vietnam in the 15th century? Or does that too qualify as non-aggression?
More like quelling rebellion Vietnam was under Chinese rule for thousand of years literally
Vietnam under Chinese rule or Bắc thuộc (北屬, which is translated to 'belonging to the north' in Vietnamese),