"What conveyed legitimacy does Israel have to invade Lebanese or Syrian airspace? NONE" This is simply wrong. They have a very legitimate reason. According to international law Hezbollah is required to disarm, or at a minimum, hand their weapons over to the Lebanese military.
Turkish jets take part in U.S.-led coalition strikes against ISIS for first time (Reuters)
from the article: United States believes Israel conducted airstrike in Syria, CNN reports