** FILE ** The euro symbol sits atop a statue at the European Parliament in Brussels. (AP Photo/Virginia Mayo)
The flags of NATO member countries fly outside the alliance's headquarters in Brussels in June 2007. (AP Photo/Virginia Mayo)
NATO Secretary-General Anders Fogh Rasmussen speaks during a media conference before a meeting of NATO foreign ministers at the alliance's headquarters in Brussels on Tuesday, Dec. 4, 2012. (AP Photo/Virginia Mayo)
** FILE ** British Prime Minister David Cameron speaks with journalists as he arrives for an EU summit at the EU Council building in Brussels on Thursday, Nov. 22, 2012. (AP Photo/Virginia Mayo)
European Union foreign policy chief Catherine Ashton (left) speaks with German Foreign Minister Guido Westerwelle during a meeting of EU foreign ministers at the EU Council building in Brussels on Monday, Dec. 10, 2012. (AP Photo/Virginia Mayo)
European Union foreign policy chief Catherine Ashton (left) speaks with German Foreign Minister Guido Westerwelle during a meeting of EU foreign ministers at the EU Council building in Brussels on Monday, Dec. 10, 2012. (AP Photo/Virginia Mayo)
U.S. Secretary of State Hillary Rodham Clinton (left) speaks with British Foreign Minister William Hague (right) during a meeting of NATO foreign ministers at the alliance's headquarters in Brussels on Wednesday, Dec. 5, 2012. (AP Photo/Virginia Mayo)
Turkish Foreign Minister Ahmet Davutoglu (left) speaks with British Foreign Minister William Hague (third from left) as U.S. Secretary of State Hillary Rodham Clinton stands at right during a meeting of NATO foreign ministers at the alliance's headquarters in Brussels on Tuesday, Dec. 4, 2012. (AP Photo/Virginia Mayo)
Turkish Foreign Minister Ahmet Davutoglu (left) speaks with British Foreign Minister William Hague (third from left) as U.S. Secretary of State Hillary Rodham Clinton stands at right during a meeting of NATO foreign ministers at the alliance's headquarters in Brussels on Tuesday, Dec. 4, 2012. (AP Photo/Virginia Mayo)
