The generally accepted worldwide rule is that airspace is owned by the country under it. You actually pay overflight fees for use of a countries airspace and are subject to its air traffic control. The corporate response will always be "don't get shot down."
In the US and most everywhere else, when you willfully ignore ATC they scramble fighter jets. Every pilot is trained in what this looks like and how to respond, but the safe next step is always to respond in the affirmative and land. https://www.boldmethod.com/learn-to-fly/regulations/inflight...
In the US and most everywhere else, when you willfully ignore ATC they scramble fighter jets. Every pilot is trained in what this looks like and how to respond, but the safe next step is always to respond in the affirmative and land. https://www.boldmethod.com/learn-to-fly/regulations/inflight...