Will Hezbollah Entry Shape Israel-Hamas War? Why US Is Wary Of Escalation With Iran's Proxy Army

Lebanon's Iran-backed Hezbollah has said it is "fully prepared" to join its Palestinian ally Hamas in the war against Israel if required. Hezbollah has been exchanging fire with Israel across the border for days in the deadliest escalation since the two sides fought a major war in 2006. However, how powerful is the group and how will its entry shape the war?