VIENNA—

U.S. Secretary of State John Kerry and Iranian Foreign Minister Mohamad Javad Zarif sit down for more talks in Vienna, on Wednesday, a day after Iran nuclear negotiators extended their deadline for an agreement to July 7.

Their talks come a day after both President Barack Obama and Iranian President Hassan Rouhani commented on the negotiations underway in Vienna.
 
Obama said the U.S. would "walk away" from a possible nuclear deal with Iran if he is not convinced it would block Tehran's path to building a nuclear weapon.
 
Rouhani said Iran would resume suspended atomic activity if Western powers broke promises made in an agreement.