Gen. Pervez Musharraf, Pakistan’s president, promised Monday that his country would not allow Islamic militants to disrupt the Afghan election from Pakistani soil, but Western diplomats in Afghanistan charged that Pakistan was, in fact, a sanctuary for Afghan militants. While Mr. Musharraf, playing host to President Hamid Karzai of Afghanistan, vowed that anyone seeking to act against Afghanistan from his soil would be stopped, the diplomats said Pakistan was turning a blind eye to just such activity.Full Story