It would seem the air defense systems used could not reliably determine what you imply they should [1][2]. I’m not sure where you’re coming from, or why it would matter what one country was known or not known to do.
[1]: https://www.technologyreview.com/2014/07/18/12951/how-can-a-...
[2]: https://www.washingtonpost.com/news/the-switch/wp/2014/07/18...
> why it would matter what one country was known or not known to do.
It absolutely matters.
Flying over a war zone with known anti aircraft missiles is quite different to flying over a low level conflict that is using small arms only.