We had drone (old Soviet model) fall on our capital in Croatia already in March. Right in the center of the city, and we never got answer how it managed to broke through from Ukraine undetected. It flew through 2 different NATO countries (Romania and Hungary) and all AWACS and other radar stations reported nothing.Only partly the issue, even if this does sound cold hearted. A deliberate attack on Poland or a stray missile is very different to one shot at and therefore flying off course.