The US-Iran peace deal already seems to be under strain as Israel and Hezbollah exchanged strikes in southern Lebanon, despite Tehran's insistence that Lebanon is part of the broader framework to end regional hostilities.

US and Iran appear close to signing the first stage of a peace deal, the two sides differ on when it will be signed.

Iran has insisted Lebanon is included in a new end to fighting in the Middle East...but Israel seems to disagree

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