Turkey's Prime Minister Recep Tayyip Erdogan (R) talks with Afghan President Hamid Karzai before a meeting as part of the Turkey-Afghanistan-Pakistan Fifth Trilateral Summit in Istanbul December 24, 2010. Osman Orsal/Reuters
Turkey's Prime Minister Recep Tayyip Erdogan (R) shakes hand with Pakistan's President Asif Ali Zardari during a meeting as part of the Turkey-Afghanistan-Pakistan Fifth Trilateral Summit in Istanbul December 24, 2010. Osman Orsal /Reuters
Turkey's Prime Minister Recep Tayyip Erdogan, left, and Iranian President Mahmoud Ahmedinejad pose for cameras before a meeting in Istanbul, Turkey, Wednesday, Dec. 22, 2010. AP
Turkish Prime Minister Recep Tayyip Erdogan, left, and his Syrian counterpart Naji al-Otari, center, inspect a military guard of honour during a ceremony before their talks in Ankara, Turkey, Tuesday, Dec. 21, 2010. Erdogan and al-Otari chaired a meeting of their countries' ministers aimed at boosting their trade and cooperation. Burhan Ozbilici/AP
Turkey's Prime Minister Recep Tayyip Erdogan (R) and Palestinian President Mahmoud Abbas meet in Ankara December 5, 2010. Adem Altan/Reuters
Turkey's Prime Minister Tayyip Erdogan (R) gestures as he welcomes Azerbaijan's President Ilham Aliyev in his office in Istanbul December 22, 2010. Tolga Bozoglu/Reuters
Greek Prime Minister George Papandreou (l) and his Turkish counterpart Recep Tayyip Erdogan during a ceremony for the 2011 Winter Universiade, or Winter University Games, an Olympic-style event that will take place later this month in the eastern city of Erzurum, Turkey, Friday, Jan. 7, 2011. AP
Iran and five world powers agreed last week to extend by four months a deadline for reaching a final deal aimed at preventing Iran from acquiring a nuclear bomb. But a yawning gulf still has to be bridged.
Though diplomats from Iran and six world powers are talking up the “substantial progress” that led to an extension of nuclear talks until November, crucial differences still threaten a final deal to ensure Iran can never produce a bomb.