Analysis: Why Lebanon is key to the future of the Israel-Iran war

After exchanging fire, Israel and Iran are both committing to stop attacks against one another. But Iran issued a key caveat: Israel must also stop its attacks on Hezbollah, its Lebanese proxy in southern Lebanon. That's a non-starter for Israel, which is vowing to intensify attacks in southern Lebanon. But Iran's new red line reflects a core part of its strategy. CNN's Jeremy Diamond examines why Lebanon could determine the future of this conflict.