Originally Posted by
Lonewolf_50
OK.
What I looked at on the map with the story I saw of the event, it appeared to be an "at the edge of the border airspace" ... but if that impression was wrongly interpreted by me, thanks for the correction.
That was not a map in the cartographic sense if the word. Try this instead:
Extract from Soviet military mapping showing Oserdòw/Осердув and the Polish Ukrainian border.