Can I speculate on something? I speculate that if those jets off in the Alaskan ADIZ had entered into American airspace, they would have been shot down by the U.S. Air Force. That's precisely why they remained in international airspace.
The corollary of that is taking place in eastern Europe, where Russia feels that NATO doesn't have the same deterrence posture and we end up with situations like what happened in Estonian airspace recently.