LongTimeIn CX:
With all due respect my friend you seem to have forgotten the Hainan Island incident of 2001 in which a USA EP-3 spy plane violated Chinese airspace and was forced down onto Hainan Island. It was given back in pieces after the owners had come hat in hand to collect it. Then there was the captured spy ship USS Pueblo which violated North Korean waters. That one was not given back as the North Koreans decided to keep it as a tourist attraction even though it is still on the USA navy list as an operating ship. BTW SS Pueblo has just been moved to a dry dock in Pyongyang. It's been repainted and looks in top condition. The bullet holes are still outlined in red circles.
If you ever make it to Beijing with a day to spare go along to the aviation section of the Chinese War Museum and take a look at the U2 spy plane that was shot down over China. It's an interesting exhibit and the preamble that accompanies it is educational.
O.P.