U.S. troops may stay in Afghanistan until ... 2024?

Rangin Dadfar Spanta, Mr Karzai’s top security adviser, told The Daily Telegraph that “remarkable progress” had been made. US officials have said they would be disappointed if a deal could not be reached by December and that the majority of small print had been agreed.

Dr Spanta said a longer-term presence was crucial not only to build Afghan forces, but also to fight terrorism.

“If [the Americans] provide us weapons and equipment, they need facilities to bring that equipment,” he said. “If they train our police and soldiers, then those trainers will not be 10 or 20, they will be thousands.

“We know we will be confronted with international terrorists. 2014, is not the end of international terrorist networks and we have a common commitment to fight them. For this purpose also, the US needs facilities.”