French Foreign Minister Laurent Fabius, U.S. State Secretary John Kerry, former European Union (EU) foreign policy chief Catherine Ashton, British Foreign Secretary Philip Hammond and German Foreign Minister Frank-Walter Steinmeier (L-R) meet for dinner at the residence of the British ambassador in Vienna November 23, 2014. Iran and six world powers looked set to miss Monday's deadline for resolving a 12-year stand-off over Tehran's nuclear ambitions and are already looking at a possible extension of the negotiations. [Photo/Agencies]