WASHINGTON -- The Afghan government is pursuing an ambitious new peace initiative in which Pakistan would replace the United States in arranging direct talks between the warring sides and the Taliban would be granted government posts that effectively could cede to them political control of their southern and eastern strongholds.

If implemented, the plan would diminish the role of the United States in the peace process, but would still leave Washington with input on a number of critical issues, including the terms for initiating negotiations. Saudi Arabia, Turkey and Great Britain also would be involved.

The plan envisions ending the war by 2015 through a ceasefire and negotiations in the second half of next year, most likely in Saudi Arabia. Pakistan would help select the leaders of the Taliban and other rebel groups who would take part in the negotiations with the Afghan government. The effort, the plan says, should be conducted “through one consistent and coherent channel,” a measure that would secure a role for Afghan President Hamid Karzai after the end of his term following April 2014 elections.

Another provision would give the insurgents a voice on “issues related . . . to the withdrawal” of the U.S.-led NATO force by the end of 2014.

The plan foresees the United States working with Kabul and Islamabad in determining which insurgent leaders would participate. The United States also would be critical to approving the removal of the insurgent negotiators from the U.N.’s list of terrorists.

Entitled “Peace Process Roadmap to 2015,” the blueprint represents a decision by Karzai – in close coordination with Pakistan – to assume the lead in peace-making efforts following the collapse earlier this year of an Obama administration bid to persuade the Taliban to participate in direct talks with Kabul.

The new initiative comes amid persistent distrust between Karzai and the Obama administration and deep insecurity in Kabul over future U.S. support. Those concerns and the U.S. failure to arrange peace talks appear to have pushed Karzai closer to Pakistan, whose army and main intelligence service are widely believed to exercise significant influence over Taliban and other militant leaders based in Pakistan’s border areas with Afghanistan.

The plan also comes as the ongoing U.S. combat troop pullout and cuts in U.S. financial aid to Afghanistan are fueling fears in both countries that violence and instability could worsen, spurring them to take matters into their own hands.

The blueprint, a copy of which was obtained by McClatchy, officially is the work of Afghanistan’s High Peace Council, which is charged with overseeing government peace efforts. But it was drafted by Karzai and his inner circle over the past six months in coordination with Pakistan, according to a person familiar with the document who requested anonymity because of the matter’s sensitivity.

The plan was presented to Pakistan and the United States during visits last month by High Peace Council Chairman Salauddin Rabbani, who Karzai named to the post after Rabbani’s father, former Afghan President Burhanuddin Rabbani, was assassinated in September 2011.

The State Department declined to comment on the plan, refusing even to confirm its existence. However, a State Department official, who requested anonymity because of the issue’s sensitivity, was authorized to say that, “The United States continues to support an Afghan-led peace process and welcomes initiatives through which Afghans sit down with other Afghans in pursuit of that goal."