Whether Israel and Hezbollah continue attacking one another could be the lynchpin that determines the longevity of the U.S.-Iran deal.

Cracks appear in the US-Israel-Iran peace deal; Israel rejects Hezbollah's inclusion, while Iran gains leverage, potentially weakening US dominance.

Ceasefire raises hopes in Lebanon, yet Israeli defiance and past violations overshadow lasting peace.

Whether Israel and Hezbollah continue attacking one another could be the lynchpin that determines the longevity of the U.S.-Iran deal.