The U.S. and Iran reached an initial agreement Monday that would extend their shaky ceasefire and lead to the reopening of the Strait of Hormuz, but significant challenges remain.

Irans nuclear program has been a key point of division. The U.S. and Israel fear it could lead to an atomic weapon — a main reason their leaders cited for going to war.

US and Iran appear close to a deal to end their war and reopen the Strait of Hormuz