KABUL: Afghan forces should be leading security operations across the country by 2014, an international conference agreed Tuesday, with the aim of relieving foreign troops in some areas by as soon as the end of the year.

The somewhat rosy picture assumes success by the 150,000 NATO-led foreign troops in an ongoing operation against the Taleban in their heartland, as well as in persuading thousands of insurgents to lay down their arms.

The current state of security, however, was starkly illustrated earlier Tuesday when a plane carrying UN Secretary-General Ban Ki-moon to the conference had to divert from Kabul airport to NATO's Bagram airfield, around 60 km away, after an insurgent rocket attack.

Despite a massive security crackdown for the conference, which drew around 60 foreign ministers including US Secretary of State Hillary Clinton, insurgents managed to land at least five rockets near the airport and diplomatic area around midnight.

They fell harmlessly, officials said.

The final communiqué from the gathering said the Afghan government would be given more responsibility for its own affairs — including security — in exchange for guarantees it will improve standards and accountability.

"Afghan National Security Forces (ANSF) should lead and conduct military operations in all provinces by the end of 2014," said the communiqué.

Lawmaker Daud Sultanzoi said the goal was laudable but "wishful thinking".

"Looking at it from a realistic perspective, it is a very good and necessary goal, but in terms of its practicality there are so many questions that have to be answered before we can really just stick to a timetable," he told Reuters.

The United States plans to start withdrawing troops from July next year, and Clinton told the conference that the target date underscored the urgency of transferring more security responsibility to the Afghan government.

"The July 2011 date captures both our sense of urgency and the strength of our resolve. The transition process is too important to push off indefinitely," she said.

The Taleban have been emboldened by talk of transition timetables and convinced that Washington is not committed to a drawn-out fight they insist they will not stop fighting until all foreign forces leave.

The communiqué said participants gave strong support for channeling at least 50 percent of development aid through the government within two years, from the current 20 percent.

More than $40 billion has been spent on Afghanistan since 2002, Oxfam says — around half towards training and equipping the army and police force.

The communiqué said Karzai also won support for a peace plan that aims to win over and reintegrate an estimated 36,000 insurgent foot soldiers while exploring talks with moderate Taleban leaders.

Lawmaker Sultanzoi said Afghanistan would rely on foreign military help until the national mindset changed. "It is not just the equipment and gear and technical things," he said. "It is also a culture that a national army has to possess in order to take control of the defense of a nation."

The murder of two American trainers and an Afghan soldier Tuesday by a renegade Afghan soldier demonstrated the hurdles that lie ahead in entrusting Afghan forces with security.

NATO's International Security Assistance Force said it was investigating whether the gunman, believed to have been an army trainer, turned his gun on his comrades in a deliberate attack or by accident during the basic training exercise. The shooter also died.