US President Barack Obama (L) talks with national security advisor Tom Donilon during the NAC (North Atlantic Council) meeting, on November 19, 2010 in Lisbon, as part of the NATO (North Atlantic Treaty Organization) Summit of Heads of States and Government held on 19-20 November 2010 in Portugal’s capital. AFP PHOTO/ TIM SLOAN (Photo credit should read TIM SLOAN/AFP/Getty Images)