According to an article in the Far Eastern Economic Review by an American diplomat, after the U.S. EP-3 and a Chinese F-8 fighter collided last April,

For the U.S. side, among the biggest surprises were the Chinese government's apparent indifference to the facts surrounding the collision, and its apparent lack of concern about international procedures that, in an emergency situation, allow one nation's aircraft to land on the territory of another without permission. Even today, it is puzzling that the Chinese government did not seem concerned about how its handling of the incident might shape regional perceptions.

Guess what? Many in the Chinese government don't give a damn what anyone thinks. On reflection, I guess that's part of the reason for the article, to embarrass the Chinese government. Like they care.