NATO chief Anders Fogh Rasmussen said on Saturday that President Hamid Karzai is unlikely to sign a pact for U.S. and NATO forces to stay in Afghanistan after 2014 and will probably leave the choice for his successor. Kabul and Washington spent months negotiating a legal framework for some U.S. troops to stay on after the end of 2014, when NATO-led forces are due to end combat operations, leaving behind a much smaller training and advisory mission.