CAMP BASTION, Afghanistan - British Prime Minister David Cameron flew into Afghanistan on Saturday to try to reinvigorate stalled peace talks with the Taliban and reassure Afghans that foreign troops will not cut and run next year.Cameron's visit to British military bases in southern Afghanistan came four days after the Taliban attacked buildings near the presidential palace in Kabul and the Afghan headquarters of the US Central Intelligence Agency (CIA), setting back already shaky attempts to end 12 years of war.That attack came a week after US and Taliban representatives had attempted to meet in the Qatari capital of Doha, a session that was cancelled amid objections from the Afghan government.