NEW : Gen. Stanley McChrystal talks with CNN 's Christiane Amanpour about insurgency . Gen. David Petraeus : Full evaluations of progress should wait until December 2010 . McChrystal told CNN on Wednesday that U.S. , Afghan and NATO forces need to cut off the Taliban insurgency from the Afghan people by establishing `` security zones '' that will gradually expand to encompass more and more territory . ` Comment: Progress `` likely will be slower '' to come in Afghanistan than it was in Iraq . Karzai 's `` aspirational '' goals would cost U.S. about $ 10 billion a year , Petraeus says .
NEW : Gen. Stanley McChrystal talks with CNN 's Christiane Amanpour about insurgency . Gen. David Petraeus : Full evaluations of progress should wait until December 2010 . Comment: Progress `` likely will be slower '' to come in Afghanistan than it was in Iraq . Karzai 's `` aspirational '' goals would cost U.S. about $ 10 billion a year , Petraeus says .