Chinese planes is a new one. Back in 1976 Russia tried to sneak in during the annual Jack Frost war games. They evidently thought with the National Guard on war games they would not be spotted. The wife of a Guardsman sent the message that a Russian jet was flying in below the radar. When you recruit an Alaskan native, you get his whole family.

https://kyivindependent.com/norad-intercepts-chinese-planes/