Israel has the "right" to send UAVs, F16s or anything she wants over other country's sovereign air space! Only Israel can determine what is or isn't illegal!! If other countries posses anything more than pea shooters, it changes the "balance" of power, and have the right to strike/attack at any time Israel chooses. This after all, is Israel!! I mean, when you are god's chosen people, how could you possibly be wrong??
North Korea leader Kim Jong Un hails accord with South as landmark (Reuters)
from the article: Report: Israel planning to attack Hezbollah arms depots in Syria