Reconnaissance. Like when they fly a red fighter jets into Taiwan air space. At first sign of intrusion, all the defense systems light up. This tells the intruder what to expect and gives them the intel needed to hack defense systems and/or devise blocking weapons in the event of an invasion. Now, in only a couple weeks, due to Biden’s criminal negligence and malfeasance in the Pentagon, Red China has effortlessly learned everything they need to know about our air defenses and how to defeat them. We sleep walked right into a box canyon.
Anyone recall the TV series of a few years ago; “Jericho”?
It was about the Chinese military invasion of the USA.