Afghans baulk at U.S. push for operations after 2014: spokesman --- (Reuters) - A U.S. bid to run unilateral counter-terrorism operations in Afghanistan after 2014 is threatening to derail a security pact between the two countries, an Afghan spokesman said, underlining Afghanistan's tenuous ties with its main backer. --- But two issues have emerged as potential "deal breakers", President Hamid Karzai's spokesman, Aimal Faizi, told reporters late on Tuesday.