Lebanon's Hezbollah chief Hassan Nasrallah on Friday will break weeks of silence since war broke out between Hamas and Israel, in a speech that could impact the region as the Gaza conflict rages. After Hamas militants launched an unprecedented October 7 attack on Israel from the Gaza Strip, Lebanon's southern border has seen escalating tit-for-tat exchanges, mainly between Israel and Hezbollah, an ally of the Palestinian group, stoking fears of a broader conflagration.