Who is Hassan Nasrallah, the Hezbollah leader who vowed retaliation against Israel

Hassan Nasrallah, Hezbollah's leader since 1992, recently addressed an attack on the group's communication devices. Supported by Iran and opposed by Israel, he has transformed Hezbollah into Lebanon's most influential political force. Despite controversies like backing Syria's Assad during the Arab Spring, Nasrallah remains a significant figure in Lebanese politics.